Community-based integrated care for patients with diabetes and depression (CIC-PDD): study protocol for a cluster randomized controlled trial - Yanshang Wang; Dan Guo; Ming Wang; Mingzheng Hu; Dawei Zhu; Qianqian Yu; Zhansheng Li; Xiaoyi Zhang; Ruoxi Ding; Miaomiao Zhao; Ping He (Trials, 2023)