1. Department of Health Research Methods, Evidence and Impact, Faculty of Health Sciences, McMaster University, Hamilton, Ontario, Canada
2. Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, Ontario, Canada
3. Faculty of Kinesiology and Health Sciences, York University, Toronto, Ontario, Canada
4. Department of Epidemiology and Biostatistics, School of Health, Shahrekord University of Medical Sciences, Shahrekord, Iran
5. Digestive Disease Research Institute, Tehran University of Medical Sciences, Tehran, Iran
6. Department of Health Research Methods, Evidence and Impact, and Department of Medicine, McMaster University, Hamilton, Ontario, Canada