地点和对象：实验在武汉大学口腔医学院完成。
SETTING and PARTICIPANTS:The experiment was completed in the School of Stomatology, Wuhan University.
地点和对象：研究在武汉大学口腔医学院完成。
SETTING and PARTICIPANTS: the study was conducted in the School of Stomatology, Wuhan University.
地点和对象：研究在武汉大学口腔医学院完成。
SETTING and PARTICIPANTS: the study was conducted in the School of Stomatology, Wuhan University.
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