Affiliation: | 1. Division of Gastroenterology and Hepatology, University of California, San Francisco, San Francisco, California;3. Division of Gastroenterology and Hepatology, Duke University, Durham, North Carolina;4. Department of Epidemiology and Biostatistics, Johns Hopkins University, Baltimore, Maryland;5. Division of Reproductive Endocrinology, Department of Obstetrics and Gynecology, University of California, San Francisco, San Francisco, California;6. Department of Pathology, University of California, San Francisco, San Francisco, California |