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Excessive daytime sleepiness assessed by the Epworth Sleepiness Scale and its association with health related quality of life: a population-based study in China

Shunquan Wu, Rui Wang, Xiuqiang Ma, Yanfang Zhao, Xiaoyan Yan and Jia He*

BMC Public Health 2012, 12:849  doi:10.1186/1471-2458-12-849

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