?:authorAffiliation
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[\'Department of Epidemiology and Health Statistics, School of Public Health, Qiqihar Medical University, Qiqihaer, China.\', \'Department of Environmental Hygiene, School of Public Health, Qiqihar Medical University, Qiqihaer, China.\', \'Department of Health Management, School of Public Health, Qiqihar Medical University, Qiqihaer, China.\', \'Department of Epidemiology and Health Statistics, School of Public Health, Qiqihar Medical University, Qiqihaer, China gejieqiao@126.com.\']
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