[1] McMaster Univ, Fac Hlth Sci, Dept Hlth Res Methods Evidence & Impact, Hamilton, ON, Canada
[2] Univ Toronto, Dept Lab Med & Pathobiol, Toronto, ON, Canada
[3] York Univ, Fac Kinesiol & Hlth Sci, Toronto, ON, Canada
[4] Shahrekord Univ Med Sci, Sch Hlth, Dept Epidemiol & Biostat, Shahrekord, Iran
[5] Univ Tehran Med Sci, Digest Dis Res Inst, Tehran, Iran
[6] McMaster Univ, Dept Hlth Res Methods Evidence & Impact, 1280 Main St West,2C Area, Hamilton L8S 4K1, ON, Canada
[7] McMaster Univ, Dept Med, Hamilton, ON, Canada