Methods The Health, Aging, and Body Composition Study was a cohort study conducted in the metropolitan areas of Memphis, Tenn, and Pittsburgh, Pa.

• 方法：这项关于健康，老龄化，和个体的研究，选取来自孟斐斯、美国田纳西州、匹兹堡、美国宾夕法尼亚州地区居民进行定群研究