Jonas HA, Kronmal RA, Psaty BM, Manolio TA, Meilahn EN, Tell GS, Tracy RP, Robbins JA, Anton-Culver H. Current estrogen-progestin and estrogen replacement therapy in elderly women: association with carotid atherosclerosis. CHS Collaborative Research Group. Cardiovascular Health Study. Ann Epidemiol. 1996  ;6(4):314-23.