1. Institute for Evidence in Medicine (for Cochrane Germany Foundation); Medical Center – University of Freiburg; Freiburg Germany
2. Department of Preventive and Social Medicine; Dunedin School of Medicine, University of Otago; Dunedin New Zealand
3. Biometrics Department; Antoni van Leeuwenhoek - Netherlands Cancer Institute; Amsterdam Netherlands
4. Charles Perkins Centre and School of Pharmacy, Faculty of Medicine and Health; The University of Sydney; Camperdown, Sydney Australia