TY - JOUR T1 - Oral contraceptives and risk of gallbladder disease JF - Canadian Medical Association Journal JO - CMAJ SP - 1517 LP - 1517 DO - 10.1503/cmaj.111-2066 VL - 183 IS - 13 AU - Mayhar Etminan Y1 - 2011/09/20 UR - http://www.cmaj.ca/content/183/13/1517.3.abstract ER -