Simona Filoni

Affiliations

Institute of Pediatrics, Fondazione Policlinico Universitario A. Gemelli IRCCS, Rome, Italy.

Publications (29)

Does hand robotic rehabilitation improve motor function by rebalancing interhemispheric connectivity after chronic stroke? Encouraging data from a randomised-clinical-trial.

Clinical neurophysiology : official journal of the International Federation of Clinical Neurophysiology

Avec: Rocco Salvatore Calabrò , Maria Accorinti , Bruno Porcari , Luigi Carioti , Laura Ciatto , Luana Billeri , Veronica Agata Andronaco , Franco Galletti , Serena Filoni , Antonino Naro

Neurophysiological and Clinical Effects of Upper Limb Robot-Assisted Rehabilitation on Motor Recovery in Patients with Subacute Stroke: A Multicenter Randomized Controlled Trial Study Protocol.

Brain sciences

Avec: Sanaz Pournajaf , Giovanni Morone , Sofia Straudi , Michela Goffredo , Maria Rosaria Leo , Rocco Salvatore Calabrò , Giorgio Felzani , Stefano Paolucci , Serena Filoni , Andrea Santamato , Marco Franceschini , The Italian PowerUPS-Rehab Study Group

Gait Recovery with an Overground Powered Exoskeleton: A Randomized Controlled Trial on Subacute Stroke Subjects.

Brain sciences

Avec: Franco Molteni , Eleonora Guanziroli , Michela Goffredo , Rocco Salvatore Calabrò , Sanaz Pournajaf , Marina Gaffuri , Giulio Gasperini , Serena Filoni , Silvano Baratta , Daniele Galafate , Domenica Le Pera , Placido Bramanti , Marco Franceschini , On Behalf Of Italian Eksogait Study Group

Short therapy in a septic arthritis of the neonatal hip.

Pediatric reports

Avec: Antonio Gatto , Ilaria Lazzareschi , Roberta Onesimo , Rossella Iannotta , Donato Rigante , Lavinia Capossela , Simona Filoni , Piero Valentini

Is the Age of Developmental Milestones a Predictor for Future Development in Down Syndrome?

Brain sciences

Avec: Chiara Locatelli , Sara Onnivello , Francesca Antonaros , Agnese Feliciello , Sonia Filoni , Sara Rossi , Francesca Pulina , Chiara Marcolin , Renzo Vianello , Enrico Toffalini , Giuseppe Ramacieri , Anna Martelli , Giulia Procaccini , Giacomo Sperti , Maria Caracausi , Maria Chiara Pelleri , Lorenza Vitale , Gian Luca Pirazzoli , Pierluigi Strippoli , Guido Cocchi , Allison Piovesan , Silvia Lanfranchi

Robot-Assisted Training for Upper Limb in Stroke (ROBOTAS): An Observational, Multicenter Study to Identify Determinants of Efficacy.

Journal of clinical medicine

Avec: Rocco Salvatore Calabrò , Giovanni Morone , Antonino Naro , Marialuisa Gandolfi , Vitalma Liotti , Carlo D'aurizio , Sofia Straudi , Antonella Focacci , Sanaz Pournajaf , Irene Aprile , Serena Filoni , Claudia Zanetti , Maria Rosaria Leo , Lucia Tedesco , Vincenzo Spina , Carmelo Chisari , Giovanni Taveggia , Stefano Mazzoleni , Nicola Smania , Stefano Paolucci , Marco Franceschini , Donatella Bonaiuti

Beyond Diagnosis: Preliminary Study of Impact on Children and Parents in Neurodevelopmental Disorders and Juvenile Idiopathic Arthritis-Associated Uveitis.

Diagnostics (Basel, Switzerland)

Avec: Roberta Palmieri , Valeria Albano , Silvana Guerriero , Francesco Craig , Francesco La Torre , Serena Filoni , Dario Sardella , Maria Giuseppina Petruzzelli , Paola Lecce , Andrea De Giacomo

Systematic review of guidelines to identify recommendations for upper limb robotic rehabilitation after stroke.

European journal of physical and rehabilitation medicine

Avec: Giovanni Morone , Angela Palomba , Alex Martino Cinnera , Michela Agostini , Irene Aprile , Chiara Arienti , Matteo Paci , Emanuela Casanova , Dario Marino , Giuseppe LA Rosa , Federica Bressi , Silvia Sterzi , Marialuisa Gandolfi , Daniele Giansanti , Luca Perrero , Alberto Battistini , Sandra Miccinilli , Serena Filoni , Monica Sicari , Salvatore Petrozzino , Claudio Marcello Solaro , Stefano Gargano , Paolo Benanti , Paolo Boldrini , Donatella Bonaiuti , Enrico Castelli , Francesco Draicchio , Vincenzo Falabella , Silvia Galeri , Francesca Gimigliano , Mauro Grigioni , Stefano Mazzoleni , Stefano Mazzon , Franco Molteni , Maurizio Petrarca , Alessandro Picelli , Federico Posteraro , Michele Senatore , Giuseppe Turchetti , Sofia Straudi , Auteur inconnu

Robot-assisted arm therapy in neurological health conditions: rationale and methodology for the evidence synthesis in the CICERONE Italian Consensus Conference.

European journal of physical and rehabilitation medicine

Avec: Francesca Gimigliano , Angela Palomba , Chiara Arienti , Giovanni Morone , Luca Perrero , Michela Agostini , Irene Aprile , Matteo Paci , Emanuela Casanova , Dario Marino , Giuseppe LA Rosa , Federica Bressi , Silvia Sterzi , Daniele Giansanti , Alberto Battistini , Sandra Miccinilli , Serena Filoni , Monica Sicari , Salvatore Petrozzino , Claudio M Solaro , Stefano Gargano , Paolo Benanti , Paolo Boldrini , Donatella Bonaiuti , Enrico Castelli , Francesco Draicchio , Vincenzo Falabella , Silvia Galeri , Mauro Grigioni , Stefano Mazzoleni , Stefano Mazzon , Franco Molteni , Maurizio Petrarca , Alessandro Picelli , Federico Posteraro , Michele Senatore , Giuseppe Turchetti , Sofia Straudi , Auteur inconnu

Assessing the Impact of Electrosuit Therapy on Cerebral Palsy: A Study on the Users' Satisfaction and Potential Efficacy.

Brain sciences

Avec: David Perpetuini , Emanuele Francesco Russo , Daniela Cardone , Roberta Palmieri , Andrea De Giacomo , Domenico Intiso , Federica Pellicano , Raffaello Pellegrino , Arcangelo Merla , Rocco Salvatore Calabrò , Serena Filoni

Identification of Functional Cortical Plasticity in Children with Cerebral Palsy Associated to Robotic-Assisted Gait Training: An fNIRS Study.

Journal of clinical medicine

Avec: David Perpetuini , Emanuele Francesco Russo , Daniela Cardone , Roberta Palmieri , Chiara Filippini , Michele Tritto , Federica Pellicano , Grazia Pia De Santis , Rocco Salvatore Calabrò , Arcangelo Merla , Serena Filoni

Psychophysiological Assessment of Children with Cerebral Palsy during Robotic-Assisted Gait Training through Infrared Imaging.

International journal of environmental research and public health

Avec: David Perpetuini , Emanuele Francesco Russo , Daniela Cardone , Roberta Palmieri , Chiara Filippini , Michele Tritto , Federica Pellicano , Grazia Pia De Santis , Raffaello Pellegrino , Rocco Salvatore Calabrò , Serena Filoni , Arcangelo Merla

Robotic versus Conventional Overground Gait Training in Subacute Stroke Survivors: A Multicenter Controlled Clinical Trial.

Journal of clinical medicine

Avec: Sanaz Pournajaf , Rocco Salvatore Calabrò , Antonino Naro , Michela Goffredo , Irene Aprile , Federica Tamburella , Serena Filoni , Andreas Waldner , Stefano Mazzoleni , Antonella Focacci , Francesco Ferraro , Donatella Bonaiuti , Marco Franceschini , TreadStroke Group

Toward Improving Diagnostic Strategies in Chronic Disorders of Consciousness: An Overview on the (Re-)Emergent Role of Neurophysiology.

Brain sciences

Avec: Luana Billeri , Serena Filoni , Emanuele Francesco Russo , Simona Portaro , David Militi , Rocco Salvatore Calabrò , Antonino Naro

Upper Limb Robotic Rehabilitation for Patients with Cervical Spinal Cord Injury: A Comprehensive Review.

Brain sciences

Avec: Giovanni Morone , Alessandro de Sire , Alex Martino Cinnera , Matteo Paci , Luca Perrero , Marco Invernizzi , Lorenzo Lippi , Michela Agostini , Irene Aprile , Emanuela Casanova , Dario Marino , Giuseppe La Rosa , Federica Bressi , Silvia Sterzi , Daniele Giansanti , Alberto Battistini , Sandra Miccinilli , Serena Filoni , Monica Sicari , Salvatore Petrozzino , Claudio Marcello Solaro , Stefano Gargano , Paolo Benanti , Paolo Boldrini , Donatella Bonaiuti , Enrico Castelli , Francesco Draicchio , Vincenzo Falabella , Silvia Galeri , Francesca Gimigliano , Mauro Grigioni , Stefano Mazzoleni , Stefano Mazzon , Franco Molteni , Maurizio Petrarca , Alessandro Picelli , Marialuisa Gandolfi , Federico Posteraro , Michele Senatore , Giuseppe Turchetti , Sofia Straudi

How may patients with MS benefit from using music assisted therapy? A case-control feasability study investigating motor outcomes and beyond.

Multiple sclerosis and related disorders

Avec: Maria Grazia Maggio , Daniele Tripoli , Bruno Porcari , Alfredo Manuli , Serena Filoni , Antonino Naro , Mareike Eschweiler , Rocco Salvatore Calabrò

Spinal Orthosis in Adolescent Idiopathic Scoliosis: An Overview of the Braces Provided by the National Health Service in Italy.

Medicina (Kaunas, Lithuania)

Avec: Cristina Maria Del Prete , Domiziano Tarantino , Mattia Giuseppe Viva , Massimiliano Murgia , Daniele Vergati , Giovanni Barassi , Eleonora Sparvieri , Eugenio Di Stanislao , David Perpetuini , Emanuele Francesco Russo , Serena Filoni , Raffaello Pellegrino

Effectiveness of robot-assisted arm therapy in stroke rehabilitation: An overview of systematic reviews.

NeuroRehabilitation

Avec: Sofia Straudi , Ludovica Baluardo , Chiara Arienti , Michela Bozzolan , Stefano G Lazzarini , Michela Agostini , Irene Aprile , Matteo Paci , Emanuela Casanova , Dario Marino , Giuseppe La Rosa , Federica Bressi , Silvia Sterzi , Daniele Giansanti , Luca Perrero , Alberto Battistini , Sandra Miccinilli , Serena Filoni , Monica Sicari , Salvatore Petrozzino , Claudio Marcello Solaro , Stefano Gargano , Paolo Benanti , Paolo Boldrini , Donatella Bonaiuti , Enrico Castelli , Francesco Draicchio , Vincenzo Falabella , Silvia Galeri , Francesca Gimigliano , Mauro Grigioni , Stefano Mazzoleni , Stefano Mazzon , Franco Molteni , Maurizio Petrarca , Alessandro Picelli , Federico Posteraro , Michele Senatore , Giuseppe Turchetti , Giovanni Morone , Auteur inconnu

Vitamin D Supplementation in Functional Recovery of Subjects with Severe Acquired Brain Injury: A Pilot Controlled Randomized Study.

Neurotrauma reports

Avec: Domenico Intiso , Antonello Marco Centra , Michele Gravina , Massimiliano Copetti , Andrea Fontana , Michelangelo Bartolo , Serena Filoni , Filomena Di Rienzo

Integrating Machine Learning with Robotic Rehabilitation May Support Prediction of Recovery of the Upper Limb Motor Function in Stroke Survivors.

Brain sciences

Avec: Sara Quattrocelli , Emanuele Francesco Russo , Maria Teresa Gatta , Serena Filoni , Raffaello Pellegrino , Leonardo Cangelmi , Daniela Cardone , Arcangelo Merla , David Perpetuini

Overground wearable powered exoskeleton for gait training in subacute stroke subjects: clinical and gait assessments.

European journal of physical and rehabilitation medicine

Avec: Michela Goffredo , Eleonora Guanziroli , Sanaz Pournajaf , Marina Gaffuri , Giulio Gasperini , Serena Filoni , Silvano Baratta , Carlo Damiani , Marco Franceschini , Franco Molteni , Auteur inconnu

Walking to your right music: a randomized controlled trial on the novel use of treadmill plus music in Parkinson's disease.

Journal of neuroengineering and rehabilitation

Avec: Rocco Salvatore Calabrò , Antonino Naro , Serena Filoni , Massimo Pullia , Luana Billeri , Provvidenza Tomasello , Simona Portaro , Giuseppe Di Lorenzo , Concetta Tomaino , Placido Bramanti

Sexual Dysfunction in Parkinson Disease: A Multicenter Italian Cross-sectional Study on a Still Overlooked Problem.

The journal of sexual medicine

Avec: Loredana Raciti , Maria Cristina De Cola , Paola Ortelli , Francesco Corallo , Viviana Lo Buono , Elisabetta Morini , Fabrizio Quattrini , Serena Filoni , Rocco Salvatore Calabrò

A transition clinic model for inflammatory bowel disease between two tertiary care centers: outcomes and predictive factors.

European review for medical and pharmacological sciences

Avec: F Scaldaferri , G Angelino , E F Romeo , L R Lopetuso , O Ricca , S Filoni , E Borrelli , F Torroni , S Faraci , F Rea , V Giorgio , M Pizzoferrato , A Poscia , D Ferrarese , G Camardese , M Neri , A Armuzzi , L Dall'Oglio , A Gasbarrini , P De Angelis

Robotic Rehabilitation in Spinal Cord Injury: A Pilot Study on End-Effectors and Neurophysiological Outcomes.

Annals of biomedical engineering

Avec: Rocco Salvatore Calabrò , Serena Filoni , Luana Billeri , Tina Balletta , Antonino Cannavò , Angela Militi , Demetrio Milardi , Loris Pignolo , Antonino Naro

Effects of robotic upper limb treatment after stroke on cognitive patterns: A systematic review.

NeuroRehabilitation

Avec: Federica Bressi , Laura Cricenti , Benedetta Campagnola , Marco Bravi , Sandra Miccinilli , Fabio Santacaterina , Silvia Sterzi , Sofia Straudi , Michela Agostini , Matteo Paci , Emanuela Casanova , Dario Marino , Giuseppe La Rosa , Daniele Giansanti , Luca Perrero , Alberto Battistini , Serena Filoni , Monica Sicari , Salvatore Petrozzino , Claudio Marcello Solaro , Stefano Gargano , Paolo Benanti , Paolo Boldrini , Donatella Bonaiuti , Enrico Castelli , Francesco Draicchio , Vincenzo Falabella , Silvia Galeri , Francesca Gimigliano , Mauro Grigioni , Stefano Mazzoleni , Stefano Mazzon , Franco Molteni , Maurizio Petrarca , Alessandro Picelli , Federico Posteraro , Michele Senatore , Giuseppe Turchetti , Giovanni Morone , Marco Gallotti , Marco Germanotta , Irene Aprile , Auteur inconnu

Radial or Focal Extracorporeal Shock Wave Therapy in Lateral Elbow Tendinopathy: A Real-Life Retrospective Study.

International journal of environmental research and public health

Avec: Raffaello Pellegrino , Angelo Di Iorio , Serena Filoni , Paolo Mondardini , Teresa Paolucci , Eleonora Sparvieri , Domiziano Tarantino , Antimo Moretti , Giovanni Iolascon

Use and Effectiveness of Electrosuit in Neurological Disorders: A Systematic Review with Clinical Implications.

Bioengineering (Basel, Switzerland)

Avec: David Perpetuini , Emanuele Francesco Russo , Daniela Cardone , Roberta Palmieri , Andrea De Giacomo , Raffaello Pellegrino , Arcangelo Merla , Rocco Salvatore Calabrò , Serena Filoni

Can non-motor outcomes be improved in chronic stroke? A systematic review on the potential role of non-invasive brain stimulation.

Brain research

Avec: Maria Grazia Maggio , Mirjam Bonanno , Serena Filoni , Irene Ciancarelli , Angelo Quartarone , Rocco Salvatore Calabrò

Réseau de co-auteurs

Serena Filoni 26 collaborations

Rocco Salvatore Calabrò 15 collaborations

Antonino Naro 7 collaborations

Giovanni Morone 7 collaborations

Sofia Straudi 7 collaborations

Franco Molteni 7 collaborations

Irene Aprile 7 collaborations

Stefano Mazzoleni 7 collaborations

Donatella Bonaiuti 7 collaborations

Emanuele Francesco Russo 7 collaborations

David Perpetuini 6 collaborations

Raffaello Pellegrino 6 collaborations

Sanaz Pournajaf 5 collaborations

Marco Franceschini 5 collaborations

Roberta Palmieri 5 collaborations

Michela Agostini 5 collaborations

Matteo Paci 5 collaborations

Emanuela Casanova 5 collaborations

Dario Marino 5 collaborations

Federica Bressi 5 collaborations

Silvia Sterzi 5 collaborations

Daniele Giansanti 5 collaborations

Luca Perrero 5 collaborations

Alberto Battistini 5 collaborations

Sandra Miccinilli 5 collaborations

Monica Sicari 5 collaborations

Salvatore Petrozzino 5 collaborations

Stefano Gargano 5 collaborations

Paolo Benanti 5 collaborations

Paolo Boldrini 5 collaborations

Enrico Castelli 5 collaborations

Francesco Draicchio 5 collaborations

Vincenzo Falabella 5 collaborations

Silvia Galeri 5 collaborations

Francesca Gimigliano 5 collaborations

Mauro Grigioni 5 collaborations

Stefano Mazzon 5 collaborations

Maurizio Petrarca 5 collaborations

Alessandro Picelli 5 collaborations

Federico Posteraro 5 collaborations

Michele Senatore 5 collaborations

Giuseppe Turchetti 5 collaborations

None None 5 collaborations

Daniela Cardone 5 collaborations

Arcangelo Merla 5 collaborations

Luana Billeri 4 collaborations

Michela Goffredo 4 collaborations

Claudio Marcello Solaro 4 collaborations

Marialuisa Gandolfi 3 collaborations

Andrea De Giacomo 3 collaborations

Chiara Arienti 3 collaborations

Federica Pellicano 3 collaborations

Giuseppe La Rosa 3 collaborations

Bruno Porcari 2 collaborations

Maria Rosaria Leo 2 collaborations

Stefano Paolucci 2 collaborations

Eleonora Guanziroli 2 collaborations

Marina Gaffuri 2 collaborations

Giulio Gasperini 2 collaborations

Silvano Baratta 2 collaborations

Placido Bramanti 2 collaborations

Antonella Focacci 2 collaborations

Angela Palomba 2 collaborations

Alex Martino Cinnera 2 collaborations

Giuseppe LA Rosa 2 collaborations

Domenico Intiso 2 collaborations

Chiara Filippini 2 collaborations

Michele Tritto 2 collaborations

Grazia Pia De Santis 2 collaborations

Simona Portaro 2 collaborations

Maria Grazia Maggio 2 collaborations

Domiziano Tarantino 2 collaborations

Eleonora Sparvieri 2 collaborations

Maria Accorinti 1 collaboration

Luigi Carioti 1 collaboration

Laura Ciatto 1 collaboration

Veronica Agata Andronaco 1 collaboration

Franco Galletti 1 collaboration

Giorgio Felzani 1 collaboration

Andrea Santamato 1 collaboration

None The Italian PowerUPS-Rehab Study Group 1 collaboration

Daniele Galafate 1 collaboration

Domenica Le Pera 1 collaboration

None On Behalf Of Italian Eksogait Study Group 1 collaboration

Antonio Gatto 1 collaboration

Ilaria Lazzareschi 1 collaboration

Roberta Onesimo 1 collaboration

Rossella Iannotta 1 collaboration

Donato Rigante 1 collaboration

Lavinia Capossela 1 collaboration

Piero Valentini 1 collaboration

Chiara Locatelli 1 collaboration

Sara Onnivello 1 collaboration

Francesca Antonaros 1 collaboration

Agnese Feliciello 1 collaboration

Sonia Filoni 1 collaboration

Sara Rossi 1 collaboration

Francesca Pulina 1 collaboration

Chiara Marcolin 1 collaboration

Renzo Vianello 1 collaboration

Enrico Toffalini 1 collaboration

Giuseppe Ramacieri 1 collaboration

Anna Martelli 1 collaboration

Giulia Procaccini 1 collaboration

Giacomo Sperti 1 collaboration

Maria Caracausi 1 collaboration

Maria Chiara Pelleri 1 collaboration

Lorenza Vitale 1 collaboration

Gian Luca Pirazzoli 1 collaboration

Pierluigi Strippoli 1 collaboration

Guido Cocchi 1 collaboration

Allison Piovesan 1 collaboration

Silvia Lanfranchi 1 collaboration

Vitalma Liotti 1 collaboration

Carlo D'aurizio 1 collaboration

Claudia Zanetti 1 collaboration

Lucia Tedesco 1 collaboration

Vincenzo Spina 1 collaboration

Carmelo Chisari 1 collaboration

Giovanni Taveggia 1 collaboration

Nicola Smania 1 collaboration

Valeria Albano 1 collaboration

Silvana Guerriero 1 collaboration

Francesco Craig 1 collaboration

Francesco La Torre 1 collaboration

Dario Sardella 1 collaboration

Maria Giuseppina Petruzzelli 1 collaboration

Paola Lecce 1 collaboration

Claudio M Solaro 1 collaboration

Federica Tamburella 1 collaboration

Andreas Waldner 1 collaboration

Francesco Ferraro 1 collaboration

None TreadStroke Group 1 collaboration

David Militi 1 collaboration

Alessandro de Sire 1 collaboration

Marco Invernizzi 1 collaboration

Lorenzo Lippi 1 collaboration

Daniele Tripoli 1 collaboration

Alfredo Manuli 1 collaboration

Mareike Eschweiler 1 collaboration

Cristina Maria Del Prete 1 collaboration

Mattia Giuseppe Viva 1 collaboration

Massimiliano Murgia 1 collaboration

Daniele Vergati 1 collaboration

Giovanni Barassi 1 collaboration

Eugenio Di Stanislao 1 collaboration

Ludovica Baluardo 1 collaboration

Michela Bozzolan 1 collaboration

Stefano G Lazzarini 1 collaboration

Antonello Marco Centra 1 collaboration

Michele Gravina 1 collaboration

Massimiliano Copetti 1 collaboration

Andrea Fontana 1 collaboration

Michelangelo Bartolo 1 collaboration

Filomena Di Rienzo 1 collaboration

Sara Quattrocelli 1 collaboration

Maria Teresa Gatta 1 collaboration

Leonardo Cangelmi 1 collaboration

Carlo Damiani 1 collaboration

Massimo Pullia 1 collaboration

Provvidenza Tomasello 1 collaboration

Giuseppe Di Lorenzo 1 collaboration

Concetta Tomaino 1 collaboration

Loredana Raciti 1 collaboration

Maria Cristina De Cola 1 collaboration

Paola Ortelli 1 collaboration

Francesco Corallo 1 collaboration

Viviana Lo Buono 1 collaboration

Elisabetta Morini 1 collaboration

Fabrizio Quattrini 1 collaboration

F Scaldaferri 1 collaboration

G Angelino 1 collaboration

E F Romeo 1 collaboration

L R Lopetuso 1 collaboration

O Ricca 1 collaboration

S Filoni 1 collaboration

E Borrelli 1 collaboration

F Torroni 1 collaboration

S Faraci 1 collaboration

F Rea 1 collaboration

V Giorgio 1 collaboration

M Pizzoferrato 1 collaboration

A Poscia 1 collaboration

D Ferrarese 1 collaboration

G Camardese 1 collaboration

M Neri 1 collaboration

A Armuzzi 1 collaboration

L Dall'Oglio 1 collaboration

A Gasbarrini 1 collaboration

P De Angelis 1 collaboration

Tina Balletta 1 collaboration

Antonino Cannavò 1 collaboration

Angela Militi 1 collaboration

Demetrio Milardi 1 collaboration

Loris Pignolo 1 collaboration

Laura Cricenti 1 collaboration

Benedetta Campagnola 1 collaboration

Marco Bravi 1 collaboration

Fabio Santacaterina 1 collaboration

Marco Gallotti 1 collaboration

Marco Germanotta 1 collaboration

Angelo Di Iorio 1 collaboration

Paolo Mondardini 1 collaboration

Teresa Paolucci 1 collaboration

Antimo Moretti 1 collaboration

Giovanni Iolascon 1 collaboration

Mirjam Bonanno 1 collaboration

Irene Ciancarelli 1 collaboration

Angelo Quartarone 1 collaboration