1. Department of Health Sciences, University of York, York, United Kingdom.
2. Centre for Statistics in Medicine, University of Oxford, Oxford, United Kingdom.
3. Department of Research, Oregon College of Oriental Medicine, Portland, Oregon, United States of America.
4. Chinese Cochrane Centre, Chinese Evidence-Based Medicine Centre, West China Hospital, Sichuan University, China.
5. Primary Care Research, Peninsula Medical School, Universities of Exeter and Plymouth, Plymouth, United Kingdom.
6. Ottawa Methods Centre, Ottawa Hospital Research Institute; Department of Epidemiology and Community Medicine, Faculty of Medicine, University of Ottawa, Ottawa, Canada.