Oral Contraception & Increased Risk of Cerebral Ischemia or Thrombosis-Collaborative GroupNEJM 288:871, 906, 1973, Corr 289:219, 1973, 289:809., , 1973
Atherosclerotic CVD-Its Nature & ManagementAm J Med 46:763, Heyden,S.,et al, 1969