The Role of Vitamin D in Combination Treatment for Patients With Rheumatoid Arthritis oleh Jianhong Wu, Jianling Dong, Shilin Li, Jiaang Luo, Yu Zhang, Hong Liu, Yuanpiao Ni, Xue Li, Jun Zhou, Hang Yang, Qianrong Xie, Xuejun Jiang, Tingting Wang, Pingxi Wang, Fanwei Zeng, Yanpeng Chu, Jing Yang, Fanxin Zeng