RT Journal Article SR Electronic T1 Risks of venous thromboembolism with various hormonal contraceptives JF Canadian Family Physician JO Can Fam Physician FD The College of Family Physicians of Canada SP 1097 OP 1097 VO 58 IS 10 A1 G. Michael Allan A1 Sudha Koppula YR 2012 UL http://www.cfp.ca/content/58/10/1097.abstract AB