Affiliation: | 1. Department of Epidemiology, Harvard T.H. Chan School of Public Health, 677 Huntington Avenue, Boston, MA, 02115, USA 2. Channing Division of Network Medicine, Department of Medicine, Brigham and Women’s Hospital, Harvard Medical School, 181 Longwood Avenue, Boston, MA, 02115, USA 3. Department of Obstetrics and Gynecology, Obstetrics and Gynecology Epidemiology Center, Brigham and Women’s Hospital, Harvard Medical School, 221 Longwood Avenue, Boston, MA, 02115, USA 4. Department of Periodontology, University of North Carolina School of Dentistry, Chapel Hill, NC, 27599-7450, USA
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