1 Department of Anesthesiology, First Affiliated Hospital of Kunming Medical University, Kunming, Yunnan Province, China.
2 Department of Pathology, Kunming Medical University, Kunming, Yunnan Province, China.
3 Department of Anesthesiology, First Affiliated Hospital of Kunming Medical University, Kunming, Yunnan Province, China. Electronic address: qianjinqiao@126.com.