N Engl J Med
From the Department of Obstetrics and Gynecology, Massachusetts General Hospital (M.F.G.), the Harvard T.H. Chan School of Public Health (D.H.), and the Dana-Farber Cancer Institute (D.H.) - all in Boston; and Nationwide Children's Hospital, Ohio State University College of Medicine, and Ohio State University College of Public Health - all in Columbus (M.A.K.).
Published: December 2020