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METHODS: 1168 subjects, over 30 years of age were derived from a random sample from a community-based population in Shuangqiao district of Chengde city. All subjects responded to a questionnaire at their own houses regarding their habits of snoring and smoking. 1168 subjec …
METHODS: 1168 subjects, over 30 years of age were derived from a random sample from a community-based population in Shuangqiao distri …