[1] Iberoamerican Cochrane Centre,Cancer Screening Unit
[2] Sant Pau Biomedical Research Institute (IIB-Sant Pau),Department of Paediatrics, Obstetrics, Gynaecology and Preventive Medicine
[3] Catalan Institute of Oncology,Interdisciplinary Centre for Health Studies (CIESAL)
[4] IDIBELL,undefined
[5] Hospitalet de Llobregat,undefined
[6] Universidad Autónoma de Barcelona,undefined
[7] Centro de Investigación Biomédica en Red de Epidemiología y Salud (CIBERESP),undefined
[8] Universidad de Valparaíso,undefined
[9] Universidad Autónoma de Barcelona,undefined
[10] Avedis Donabedian Research Institute (FAD),undefined
[11] Red de Investigación en Servicios de Salud en Enfermedades Crónicas (REDISSEC),undefined
[12] OptiMedis,undefined
[13] University of Witten/Herdecke,undefined
[14] Netherlands Institute for Health Services Research (Nivel),undefined