1. Karolinska Institutet; Department of Public Health Sciences; Solnavägen 1E Stockholm Sweden 11365, Solna
2. Julius Center for Health Sciences and Primary Care, University Medical Center Utrecht, Utrecht University; Cochrane Netherlands; Room Str. 6.131 PO Box 85500 Utrecht Netherlands 3508 GA
3. Academic Medical Center; Radiation Oncology and Hyperthermia; P.O. Box 22700 Meibergdreef 9 Amsterdam Netherlands 1100 DE
4. Belgian Health Care Knowledge Centre; Kruidtuinlaan 55 Brussels Belgium 1000