Effect of vitamin A supplementation on gut microbiota in children with autism spectrum disorders - a pilot study oleh Juan Liu, Xiao Liu, Xue-Qin Xiong, Ting Yang, Ting Cui, Na-Li Hou, Xi Lai, Shu Liu, Min Guo, Xiao-Hua Liang, Qian Cheng, Jie Chen, Ting-Yu Li