Cardiovascular mortality and noncontraception use of estrogen in women: results from the lipid research clinics follow-up study. - Bush,T.L.; Barrett-Connor,E.; Covan,L.D.; Criqui,M.H.; Wallace,R.B.; Suclindran,C.M.; Tyroler,H.A.; Rifkind,B.M. (Circulation, 1987)