单位：解放军第四军医大学护理系及基础部教学实验中心，西京医院康复理疗科。

SETTING: Nursing Department of the Fourth Military Medical University of Chinese PLA, Laboratory Center of Basic Faulty, and Department of Rehabilitative Physioltherapy of Xijing Hospital.

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地点和材料：实验地点在第四军医大学口腔生物学教研室和西京医院核医学科。

SETTING and MATERIALS:Research was carried out in the Department of Oral Biolo gy, and Department of Nuclear Medicine of Xijing Hospital, Fourth Military Medical University.

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