1. University Hospital of Igualada, 08700 Igualada, Spain
2. Faculty of Medicine, Vic-Central University of Catalonia, 08500 Vic, Spain
3. Health Promotion in Rural Areas Research Group, Institut Català de la Salut, 08272 Sant Fruitós de Bages, Spain
4. Central Catalonia Research Support Unit, Jordi Gol i Gurina University Institute for Research in Primary Health Care Foundation, 08007 Barcelona, Spain
5. Primary Care Centre Vilanova del Camí, 08788 Vilanova del Camí, Spain
6. Primary Care Centre Sant Joan de Vilatorrada, 08250 Sant Joan de Vilatorrada, Spain