title: Reply to R Wang and P Chen.
authors.affiliation: From the New York Obesity Nutrition Research Center, the Department of Medicine, College of Physicians and Surgeons, Columbia University, New York, NY (DG, e-mail: dg108@columbia.edu; SH).
authors.forename: Dympna
authors.initials: D
authors.lastname: Gallagher
authors.affiliation: From the New York Obesity Nutrition Research Center, the Department of Medicine, College of Physicians and Surgeons, Columbia University, New York, NY (DG, e-mail: dg108@columbia.edu; SH).
authors.forename: Stanley
authors.initials: S
authors.lastname: Heshka