[1] McMaster University,Department of Obstetrics and Gynecology
[2] University of Western Ontario,School of Kinesiology
[3] New Leaf Psychology,Department of Psychology, Neuroscience & Behavior
[4] McMaster University,Department Clinical Epidemiology and Biostatistics
[5] McMaster University,Midwifery Education Program, Department of Family Medicine
[6] McMaster University,Division of Maternal
[7] McMaster University,Fetal Medicine, Departments of Obstetrics & Gynecology, Radiology, and Clinical Epidemiology & Biostatistics