1. Iberoamerican Cochrane Centre; C/ Sant Antoni Maria Claret 167 Pavelló 18 Planta 0 Barcelona Barcelona Spain 08025
2. Universidad de Antofagasta; Faculty of Medicine and Dentistry; Antofagasta Chile
3. Servicio de Salud Antofagasta; Antofagasta Chile
4. University Medical Center Utrecht; Department of Nephrology and Hypertension and Julius Center for Health Sciences and Primary Care; Heidelberglaan 100 Utrecht Netherlands 3584 CX
5. CIBER Epidemiología y Salud Pública (CIBERESP); Iberoamerican Cochrane Centre, Biomedical Research Institute Sant Pau (IIB Sant Pau); Sant Antoni Maria Claret, 167 Pavilion 18 (D-53) Barcelona Catalonia Spain 08025
6. Universitat Autònoma de Barcelona; Sant Antoni Maria Claret, 167 Pavilion 18 (D-13) Barcelona Catalunya Spain 08025