Weekend and off-hour effects on the incidence of cerebral palsy: contribution of consolidated perinatal care by Satoshi Toyokawa, Junichi Hasegawa, Tsuyomu Ikenoue, Yuri Asano, Emi Jojima, Shoji Satoh, Tomoaki Ikeda, Kiyotake Ichizuka, Satoru Takeda, Nanako Tamiya, Akihito Nakai, Keiya Fujimori, Tsugio Maeda, Hideaki Masuzaki, Hideaki Suzuki, Shigeru Ueda

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