1 Clinical Epidemiology Program, Ottawa Hospital Research Institute; University of Ottawa, Canada.
2 Library Services, Children's Hospital of Eastern Ontario, Canada.
3 Child and Youth Data Laboratory, Alberta Centre for Child, Family and Community Research, Canada.
4 Department of Biostatistics and Center for Evidence Based Medicine, Brown University, USA.
5 University of Queensland, Australia.
6 Centre for Rehabilitation Research, Sydney Medical School - Northern, University of Sydney, Australia.
7 Department of Anesthesia and Pain Medicine, The Hospital for Sick Children, University of Toronto, Canada; Institute of Health Policy, Management and Evaluation, Dalla Lana School of Public Health, University of Toronto, Canada.
8 Tufts University School of Medicine, USA.
9 University of California, Merced, USA.
10 Department of Internal Medicine, University of California, Davis, USA.
11 Department of Clinical Epidemiology & Biostatistics, McMaster University, Canada.
12 Centre for Statistics in Medicine, University of Oxford, UK.
13 Department of Pediatrics, Faculty of Medicine and Dentistry, University of Alberta, Canada svohra@ualberta.ca.