[1] Avedis Donabedian Res Inst FAD, Provenca 293, Barcelona 08037, Spain
[2] Univ Autonoma Barcelona, Placa Civ, Barcelona 08103, Spain
[3] Network Res Chron Primary Care & Hlth Promot RICA, Madrid, Spain
[4] Goethe Univ, Inst Gen Practice, Theodor Stern Kai 7, D-60590 Frankfurt, Germany
[5] Biomed Res Inst St Pau IIB St Pau, Iberoamer Cochrane Ctr, Carrer St Quinti 77, Barcelona 08025, Spain
[6] Netherlands Inst Hlth Serv Res NIVEL, Otterstraat 118, NL-3513 Utrecht, Netherlands
[7] Univ Ioannina, Sch Educ, Dept Primary Educ, Ioannina 45110, Greece
[8] St Michaels Hosp, Li Ka Shing Knowledge Inst, Knowledge Translat Program, Toronto, ON M5B 1T8, Canada
[9] Univ Toronto, Inst Hlth Policy Management & Evaluat, Toronto, ON M5T 3M6, Canada
[10] OptiMedis, Burchardstr 17, D-20095 Hamburg, Germany
[11] CIBER Epidemiol & Salud Publ CIBERESP, Barcelona, Spain