1. Venous thromboembolic disease and combined oral contraceptives: results of international multicentre case-control study;World Health Organization Collaborative Study of Cardiovascular Disease and Steroid Hormone Contraception;Lancet,1995
2. World Health Organization Collaborative Study of Cardiovascular Disease and Steroid Hormone Contraception, A multinational case-control study of cardiovascular disease and steroid hormone contraceptives: description and validation of methods, J Clin Epidemiol ((in press)).
3. Metabolism of levonorgestrel, norethindrone and structurally related contraceptive steroids;Stanczyk;Contraception,1990
4. Clinical pharmacokinetics of contraceptive steroids: an update;Shenfield;Clin Pharmacokinet,1991