aMassachusetts General Hospital, Department of Obstetrics and Gynecology, Division of Reproductive Endocrinology and Infertility

bMassachusetts General Hospital, MGH Weight Center, Department of Medicine-Division of Endocrinology-Neuroendocrine, Department of Pediatrics-Division of Endocrinology, Nutrition Obesity Research Center at Harvard (NORCH), Boston, MA

cHarvard T.H. Chan School of Public Health, USA

Correspondence to Evelyn Minis, Massachusetts General Hospital, Boston, MA 02114, USA. E-mail: [email protected]