1. Department of Cardiovascular Surgery, The Second Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan, China (mainland)
2. Department of Geriatric Endocrinology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan, China (mainland)
3. Department of Intensive Care Unit (ICU), The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan, China (mainland)