Association between maternal outdoor physical exercise and the risk of preterm birth: a case-control study in Wuhan, China by Miao Cai, Bin Zhang, Rong Yang, Tongzhang Zheng, Guanghui Dong, Hualiang Lin, Steven E. Rigdon, Hong Xian, Leslie Hinyard, Pamela K. Xaverius, Echu Liu, Thomas E. Burroughs, Daire R. Jansson, Morgan H. LeBaige, Shaoping Yang, Zhengmin Qian

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