1. Department of Thoracic Surgery, Yantai Affiliated Hospital of Binzhou Medical University, Yantai, Shandong 264100, P.R. China
2. Department of Endocrinology, Yantai Affiliated Hospital of Binzhou Medical University, Yantai, Shandong 264100, P.R. China
3. School of Basic Medical Sciences, Binzhou Medical University, Yantai, Shandong 264003, P.R. China