Walker AM, Jick H, Hunter JR, Danford A, Watkins RN, Alhadeff L, Rothman KJ. Vasectomy and non-fatal myocardial infarction. Lancet. 1981 Jan 3;1(8210):13-5.
Rosenberg L, Hennekens CH, Rosner B, Belanger C, Rothman KJ, Speizer FE. Early menopause and the risk of myocardial infarction. Am J Obstet Gynecol. 1981 Jan 1;139(1):47-51.