Outcomes in a Program that Offers Financial Rewards for Weight Loss
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Obesity rates in the U.S. have doubled since 1980. Given the medical, social, and financial costs of obesity, a large percentage of Americans are attempting to lose weight at any given time but the vast majority of weight loss attempts fail. Researchers continue to search for safe and effective
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美国国家经济研究局创建时间：
2009-05-01
