1Division of Hematology, Department of Medicine, University of Calgary, Calgary, Canada
2Department of Obstetrics and Gynecology, Western University, London, Canada
3Division of Hematology, Department of Medicine, McMaster University, Hamilton, Canada
4Division of Hematology, Department of Medicine, The Ottawa Hospital, Ottawa Blood Disease Centre, Ottawa, CAN
5Department of Obstetrics and Gynecology, The University of Utah Health Sciences Center, Salt Lake City, UT
6Division of Hematology, Department of Medicine, The Ottawa Hospital, Ottawa Blood Disease Centre, Ottawa, Canada