Xiao Cheng Qi Decoction, an Ancient Chinese Herbal Mixture, Relieves Loperamide-Induced Slow-Transit Constipation in Mice: An Action Mediated by Gut Microbiota oleh Amanguli Tuohongerbieke, Huaiyou Wang, Jiahui Wu, Zhengqi Wang, Tingxia Dong, Yamiao Huang, Dequan Zhu, Dongmei Sun, Karl Wah Keung Tsim