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National survey of the association of depressive symptoms with the number of off duty and on-call, and sleep hours among physicians working in Japanese hospitals: a cross sectional study

Koji Wada*, Toru Yoshikawa, Takahisa Goto, Aizan Hirai, Eisuke Matsushima, Yoshifumi Nakashima, Rie Akaho, Michiko Kido and Takashi Hosaka

BMC Public Health 2010, 10:127  doi:10.1186/1471-2458-10-127

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