Additional file 1: Figure S1. of Chinese Registry of rheumatoid arthritis (CREDIT): II. prevalence and risk factors of major comorbidities in Chinese patients with rheumatoid arthritis JinShangyi LiMengtao FangYongfei LiQin LiuJu DuanXinwang LiuYi WuRui ShiXiaofei WangYongfu JiangZhenyu WangYanhong YuChen WangQian TianXinping ZhaoYan ZengXiaofeng 2017 Map of the CREDIT registry participating centers. (DOC 3195 kb)