1. Department of Histology and Embryology; Harbin Medical University; Harbin People's Republic of China
2. Institute of Cancer Prevention and Treatment; Harbin Medical University; Harbin People's Republic of China
3. Department of Respiratory; the Second Affiliated Hospital of Harbin Medical University; Harbin People's Republic of China
4. Department of Nephrology; the First Affiliated Hospital of Harbin Medical University; Harbin People's Republic of China
5. Teaching Experiment Center of Morphology; Harbin Medical University; Harbin People's Republic of China