1. Epidemiology Service, Public Health Directorate of the Balearic Islands Regional Government, Palma, Institut d'Investigació Sanitaria de les Illes Balears (IdISBA), Palma
2. Epidemiology Service, Public Health Directorate of the Balearic Islands Regional Government, Palma
3. Epidemiology Service, Public Health Agency of Barcelona, Barcelona, Centro de Investigacion Biomedica en Red de Epidemiologia y Salud Publica, Barcelona, Spain