Received:December 28, 2018  Revised:December 28, 2018
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wanglijiao 哈尔滨医科大学附属第二医院老年病房科 1421834382@qq.com 
FAN Ying 哈尔滨医科大学附属第二医院老年病房科 fanyingyan@163.com 
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