From the Department of Pediatrics (M.D., B.T.C., H.C., A.K.), University of Calgary; Calgary Pediatric Stroke Program (M.D., B.T.C., H.C., A.K.); Alberta Children's Hospital Research Institute (M.D., B.T.C., H.C., A.K.); Hotchkiss Brain Institute (M.D., B.T.C., H.C., A.K.); Pediatric Stroke Program (A.N.); Department of Obstetrics and Gynecology (K.C.); Department of Pediatrics (K.M., M.J.E.), University of Calgary; Department of Pediatrics (L.C.), University of Alberta, Edmonton, Canada; Department of Obstetrics and Gynecology (A.C.), Oregon Health & Science University, Portland, OR; and Department of Clinical Neurosciences and Radiology (A.K.), University of Calgary, Alberta, Canada.