1. Department of Obstetrics and Gynecology, University of Washington1959 NE Pacific Street, Box 356460, Seattle, WA 98195 USA
2. Department of Family Medicine, University of Washington, 1959 NE Pacific Street, Box 354696, Seattle, Washington 98195-4696 USA
3. Department of Obstetrics and Gynecology, Oregon Health and Science University, 3181 SW Sam Jackson Park Rd UHN=50, Portland, OR 97239 US