Association of physical activity with risk of hip fractures in elderly in Guangdong: case-control study
GUAN Ke, SHI Wen-qi, LIU Yan-hua, WANG Cheng, CHEN Yu-ming.
S China J Prev Med . 2014, (2): 109 -113 .  DOI: 10.13217/j.scjpm.2014.0109

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