1. Netherlands institute for health services research (Nivel), Utrecht, Netherlands
2. Iberoamerican Cochrane Centre Barcelona, Barcelona, Spain
3. Biomedical Research Institute Sant Pau (IIB Sant Pau), Barcelona, Spain
4. Avedis Donabedian Research Institute (FAD), Barcelona, Spain
5. Universitat Autonoma de Barcelona, Barcelona, Spain
6. Red de investigación en servicios de salud en enfermedades crónicas (REDISSEC), Galdakao, Spain
7. Department of Family Medicine, Care and Public Health Research Institute (CAPHRI), Maastricht University, Maastricht, Netherlands