1. Centre for Menstrual Cycle and Ovulation Research, Endocrinology and Metabolism; University of British Columbia; Vancouver British Columbia Canada
2. British Columbia Women’s Health Research Institute; Vancouver British Columbia Canada
3. Kaiser Permanente Washington Health Research Institute, Kaiser Permanente Washington; Seattle Washington
4. Postgraduate Program in Gynecology, Obstetrics, and Mastology; Discipline of Adolescent Medicine; Department of Pediatrics; Botucatu Medicine School; São Paulo State University (UNESP); Botucatu São Brazil
5. Department of Obstetrics & Gynecology; The University of Texas Medical Branch; Galveston Texas
6. School of Population and Public Health; University of British Columbia; Vancouver British Columbia Canada