Balearic Islands Health Research Institute (IdISBa), Carretera de Valldemossa, 79, 07120 Palma, Illes Balears, Spain; Directorate of General Health Service, Balearic Public Health Service (Ib-Salut), Reina Esclaramunda n9, 07005 Palma, Illes Balears, Spain. Electronic address: eugenia.carandell@ibsalut.es.