J G Thorne1, P D James2, R L Reid3. 1. Contraception Advice Research and Education (CARE), Department of Obstetrics and Gynecology, Queens University, Kingston, Ontario, Canada, K7L2V7. 2. Department of Medicine, Division of Hematology, Queens University, Kingston, Ontario, Canada, K7L2V7. 3. Department Obstetrics and Gynecology, Chair, Division of Reproductive Endocrinology, Queens University, Kingston, Ontario, Canada, K7L2V7. Electronic address: robert.reid@queensu.ca.