Efficacy of Qingpeng ointment (a Tibetan medicine) for acute gouty arthritis: a multi-center, randomized, double-blind, placebo-controlled trial oleh Ya-xi Shang, Shu-feng Wei, Ke-peng Yang, Yuan Liu, Su Wei, Xia Dong, Xin-chang Wang, Zhi-min Xie, Ru-lu Fang, Li-na Liang, Xiu-feng Li, Lei Xu, Mu-zhi Chen, Kai-xian Zhang, Ji-yong Huang, Le Wang, You-guo Yang, Hong-li Liao, Gui-e Xing, Yu-ping Zheng, Xiao-fen Li, Jing-lian Lin, Cheng-qian Shi, Yong-ping Zeng, Li-dan Mo, Fan Sun, Xiao-peng Li, Zhuo Zhang, Kai Chen, Zhao-chun He, Jian-ping Liu