Ritenbaugh Cheryl, Patterson Ruth E, Chlebowski Rowan T, Caan Bette, Fels-Tinker Lesley, Howard Barbara, Ockene Judy
Kaiser Permanente Center for Health Research, Portland, OR, USA.
Ann Epidemiol. 2003 Oct;13(9 Suppl):S87-97. doi: 10.1016/s1047-2797(03)00044-9.