Self rated sleep status and related factors among people aged 65 years and over in Yiling rural mountainous area, Yichang
WANG Kaiyu，ZHANG Xinhua, YI Liping, HANG Weidong ,SUN Bing, ZHOU Zonghui
S China J Prev Med . 2015, (5): 419 -423 .  DOI: 10.13217/j.scjpm.2015.0419

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