1 Division of Adolescent and Young Adult Medicine, Department of Pediatrics, Boston Children's Hospital and Harvard Medical School, Boston, MA, USA. Amy.shafrir@childrens.harvard.edu.
2 Boston Center for Endometriosis, Brigham and Women's Hospital and Boston Children's Hospital, Boston, MA, USA. Amy.shafrir@childrens.harvard.edu.
3 Division of Adolescent and Young Adult Medicine, Department of Pediatrics, Boston Children's Hospital and Harvard Medical School, Boston, MA, USA.
4 Boston Center for Endometriosis, Brigham and Women's Hospital and Boston Children's Hospital, Boston, MA, USA.
5 Department of Obstetrics, Gynecology, and Reproductive Biology, College of Human Medicine, Michigan State University, Grand Rapids, MI, USA.
6 Department of Epidemiology, Harvard T.H. Chan School of Public Health, Boston, MA, USA.