Difficult and complicated oral ulceration: an expert consensus guideline for diagnosis by Xin Zeng, Xin Jin, Liang Zhong, Gang Zhou, Ming Zhong, Wenmei Wang, Yuan Fan, Qing Liu, Xiangmin Qi, Xiaobing Guan, Zhimin Yan, Xuemin Shen, Yingfang Wu, Lijie Fan, Zhi Wang, Yuan He, Hongxia Dan, Jiantang Yang, Hui Wang, Dongjuan Liu, Hui Feng, Kai Jiao, Qianming Chen

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