1. From the Departments of Obstetrics and Gynaecology (S.S., Y.X., S.T.D.) and Physiology (S.S., Y.X., S.T.D.) and Cardiovascular Research Group and Women and Children’s Health Research Institute (S.T.D.), University of Alberta, Edmonton, Alberta, Canada; and Vascular Physiology (T.S.), National Cardiovascular Center Research Institute, Osaka, Japan.