Affiliation: | 1. Department of Respiratory, the Second Affiliated Hospital of Harbin Medical University, Harbin, People's Republic of China;2. Department of Nephrology, the First Affiliated Hospital of Harbin Medical University, Harbin, People's Republic of China;3. Department of Histology and Embryology, Harbin Medical University, Harbin, People's Republic of China;4. Teaching Experiment Center of Morphology, Harbin Medical University, Harbin, People's Republic of China |