Seven-day services in surgery and the “weekend effect” at a Japanese teaching hospital: a retrospective cohort study by Masaaki Matoba, Takashi Suzuki, Hirotaka Ochiai, Takako Shirasawa, Takahiko Yoshimoto, Akira Minoura, Hitomi Sano, Mizue Ishii, Akatsuki Kokaze, Hiroshi Otake, Tsuyoshi Kasama, Yumi Kamijo

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