1. From the Department of Obstetrics and Gynecology (J.L.S., I.J.A., R.P., C.F.R.-C., S.T.D., P.N.B.) and Cardiovascular Research Centre (C.F.R.-C., S.T.D.), University of Alberta, Edmonton, Alberta, Canada; Maternal and Fetal Health Research Centre (C.P.S.), University of Manchester, Manchester, United Kingdom; Women's and Children's Health Research Institute (J.L.S., I.J.A., R.P., C.F.R.-C., S.T.D., P.N.B.), Edmonton, Alberta, Canada.