Association between Serum Cystatin C levels and long‐term cardiovascular outcomes and all-cause mortality in older patients with obstructive sleep apnea oleh Jian-Hua Li, Ying-Hui Gao, Xin Xue, Xiao-Feng Su, Huan-Huan Wang, Jun-Ling Lin, Li-Bo Zhao, Xiao Zou, Yan Gao, Jing-Jing Guo, Min Shi, Wei-Hao Xu, Ya-Bin Wang, Xiao-Shun Qian, Kai-Bing Chen, Li Fan, Lin Liu