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Memo
作者单位：青岛市儿童医院外二科（山东省，266011），第一作者刘鸿坚现为青岛大学医学院在读硕士研究生；通讯作者：杨传民，青岛大学医学院附属医院小儿外科（山东省，266003），Email:liuhongjian76@126.com