The causal relationship between gut microbiota and bone mineral density: a Mendelian randomization study oleh Ying Wang, Ying Wang, Xuejian Zhang, Guangjun Tang, Guangjun Tang, Pin Deng, Yuyan Qin, Yuyan Qin, Jinglu Han, Jinglu Han, Shulong Wang, Shulong Wang, Xiaojie Sun, Xiaojie Sun, Dongxiao Li, Dongxiao Li, Zhaojun Chen