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Proportion of participants by industry, sex, and age group.

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posted on 2019-07-15, 17:32 authored by Takashi Yamauchi, Takeshi Sasaki, Kunihiko Takahashi, Shigeo Umezaki, Masaya Takahashi, Toru Yoshikawa, Machi Suka, Hiroyuki Yanagisawa

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    workernear-missesrepresentative samplesleep-related problems51 hours

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