1. Julius Center for Health Sciences and Primary Care, University Medical Center Utrecht Utrecht University Utrecht the Netherlands
2. Radboud Institute for Health Sciences (RIHS) Radboud University Medical Center Nijmegen the Netherlands
3. School of Medicine Keele University Keele UK
4. Department of Biostatistics Vanderbilt University School of Medicine Nashville Tennessee USA
5. Cochrane Netherlands, University Medical Center Utrecht Utrecht University Utrecht the Netherlands