The safety and tolerability of alkaloids from Alstonia scholaris leaves in healthy Chinese volunteers: a single-centre, randomized, double-blind, placebo-controlled phase I clinica... oleh Zhong-Ping Gou, Yun-Li Zhao, Lin-Ling Zou, Ying Wang, Shi-Qing Shu, Xiao-Hong Zhu, Li Zheng, Qi Shen, Zhu Luo, Jia Miao, Yong-Sheng Wang, Xiao-Dong Luo, Ping Feng