RT Journal Article SR Electronic T1 Benign hepatic tumors and cysts in women using oral contraceptive agents JF Cleveland Clinic Journal of Medicine JO Cleve Clin J Med FD Cleveland Clinic SP 41 OP 47 VO 44 IS 1 A1 Thomas R. Havrilla A1 Richard G. Pepe A1 Ralph J. Alfidi A1 John R. Haaga YR 1977 UL http://www.ccjm.org/content/44/1/41.abstract AB