1. Department of Physiology and Pharmacology, Cumming School of Medicine, University of Calgary, 3330 Hospital Drive NW Calgary, AB T2N 4N1, Canada.
2. Department of Clinical Pharmacology, Weill School of Medicine, Catholic University of Health and Allied Sciences, PO Box 1464, Mwanza, Tanzania.
3. Department of Obstetrics and Gynaecology, Cumming School of Medicine, University of Calgary, 3330 Hospital Drive NW Calgary, AB T2N 1N4, Canada.