Comparative outcomes of heart failure among existent classes of anti-diabetic agents: a network meta-analysis of 171,253 participants from 91 randomized controlled trials oleh Da-ya Yang, Xin He, Hui-wei Liang, Shao-zhao Zhang, Xiang-bin Zhong, Chu-fan Luo, Zhi-min Du, Jian-gui He, Xiao-dong Zhuang, Xin-xue Liao