One year evaluation of endodontic microsurgery in 54 cases with persistent apical periodontitis
Shen Jing, Zhang Haifeng, Jin Shufeng, Li Ningning, Fan Jianrong.
West China Journal of Stomatology . 2012, (4): 388 -392 .  DOI: 10.3969/j.issn.1000-1182.2012.04.014

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