1. CIBER Epidemiología y Salud Pública (CIBERESP) - Universitat Autònoma de Barcelona; Iberoamerican Cochrane Centre - Biomedical Research Institute Sant Pau (IIB Sant Pau); Barcelona Catalunya Spain 08041
2. University Hospital Central de Asturias; Department of Preventive Medicine; Avenida de Roma s/n Oviedo Oviedo Spain 33006
3. Public Health Institute of Navarre, CIBER Epidemiología y Salud Pública (CIBERESP), IdiSNA; C/ Leyre 15 Pamplona Navarre Spain E-31003
4. Marilia Medical School; Department of General Internal Medicine and Clinical Epidemiology Unit; Avenida Monte Carmelo 800 Fragata Marilia São Paulo Brazil 17519-030
5. Independent consultant; Via al Parco 18 Milan Italy 21014