1. Epidemiology Unit, Department of Cardiology, Vall d'Hebron Hospital, Barcelona, Spain
2. Consorcio de Investigación Biomédica en Red de Epidemiología y Salud Pública (CIBERESP), Madrid, Spain
3. Department of Pediatrics, Obstetrics and Gynecology and Public Health of Universitat Autònoma de Barcelona, Cerdanyola del Vallés, Spain
4. Unit of Research Support, Primary Care Research Institute (IDIAP) Jordi Gol, Catalan Institute of Health, Lleida, Spain
5. Department of Statistics and Operations Research, Universitat Politècnica de Catalunya, Barcelona, Spain