Author contributions
Zhang Ping and Xiang Shilong contributed equally to this manuscript. Zhang Ping and Chen Jianghua made substantial contributions to the conception and design of the work. Xiang Shilong drafted the manuscript. Zhang Ping and Xiang Shilong contributed to data analysis. Zhang Ping contributed to data interpretation. All authors approved the final manuscript as submitted and agree to be accountable for all aspects of the work. All authors contributed to the article and approved the submitted version. The following doctors participated in this prospective double-blind study: Liu Bicheng, Wang Xiaohui, Yang Xiaoping, Ye Chaoyang, Wang Zunsong, Li Yanlin, Li Zhou, Wang Caili, Li Hongbo, Huang Jian, Peng Ai, Wang Xiaoping, Wang Deguang, Xiao Jie, Chen Wenli, Cheng Hong, Mao Nan, Wang Jianqin, Yang Lin.