Dr. Michael Greene is the Chief of Obstetrics at Massachusetts General Hospital and a Professor of Obstetrics, Gynecology, and Reproductive Biology at Harvard Medical School. Stephen Morrissey, the interviewer, is the Managing Editor of the Journal. S. Morain, M.F. Greene, and M.M. Mello. A New Era in Noninvasive Prenatal Testing. N Engl J Med 2013;