Efficacy and safety of Bacteroides fragilis BF839 for pediatric autism spectrum disorder: a randomized clinical trial oleh Chu-hui Lin, Ting Zeng, Cui-wei Lu, De-yang Li, De-yang Li, Yi-ying Liu, Bing-mei Li, Bing-mei Li, Sheng-qiang Chen, Yu-hong Deng, Yu-hong Deng, Yu-hong Deng