1. College of Clinical Medicine, Jilin University, Changchun, China;
2. Department of Thoracic Surgery, The First Hospital of Norman Bethune, Jilin University, Changchun, China;
3. Department of Histology and Embryology, College of Basic Medical Sciences, Jilin University, Changchun, China;
4. Laboratory Teaching Center of Basic Medicine, College of Basic Medical Sciences, Jilin University, Changchun, China