Zane A Tymchak1, Annette Epp2, Daryl R Fourney1. 1. Division of Neurosurgery, Department of Surgery, University of Saskatchewan, 103 Hospital Drive, Saskatoon, SK, S7H 0N3, Canada. 2. Department of Obstetrics, Gynecology and Reproductive Sciences, University of Saskatchewan, 103 Hospital Drive, Saskatoon, SK, S7H 0N3, Canada.