作者单位：Northwestern Univ, Feinberg Sch Med, Dept Prevent Med, Chicago, IL 60611 USA[1]Weight Watchers Int Inc, New York, NY USA[2]Northwestern Univ, Feinberg Sch Med, Div Gen Internal Med & Geriatr, Chicago, IL 60611 USA[3]Puentes Salud Hlth Ctr, Philadelphia, PA USA[4]Temple Univ, Coll Publ Hlth, Ctr Obes Res & Educ, Philadelphia, PA 19122 USA[5]Univ Penn, Perelman Sch Med, Philadelphia, PA 19104 USA[6]
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