The Kailuan study is a prospective cohort study, which was conducted in the Kailuan community in the city of Tangshan, China. The city of Tangshan has ~7.2 million inhabitants and situated about 150 ...
Most Chinese spend an average of 6.75 hours sleeping; students, office workers, and retirees often sleep only after midnight, and only a fifth stated they do not suffer problems related to sleep.
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