Optimized anti-tuberculosis duration for drug-susceptible pulmonary tuberculosis-diabetes mellitus comorbidities: study protocol for a multicenter randomized controlled trial oleh Peize Zhang, Huaifang Shi, Yongping Xie, Jiemei Liang, Qiumeng Hu, Liang Fu, Yuxiang Wang, Jie Tan, Senlin Zhan, Hongjuan Qin, Guanghui Xu, Guofang Deng