Efficacy and safety of traditional Chinese patent medicine in collaboration with anti-hyperglycemic drugs on type 2 diabetes: study protocol for a multicenter, prospective cohort study

Bing Pang, Shuo Feng, Ning Su, Hua-Jie Hu, Ye Sun, Ai-Mei Cao, Chun-Qian Lu, Wei-Hua Zhang, Qing Ni