1. Department of Human Anatomy, Histology and Embryology, Institute of Basic Medical Sciences, Neuroscience Center, Chinese Academy of Medical Sciences, School of Basic Medicine, Peking Union Medical College, Beijing, China
2. Eight-year MD Program, Peking Union Medical College, Beijing, China
3. National Experimental Teaching Demonstration Center of Basic Medicine, Peking Union Medical College, Beijing, China
4. Department of Surgery, Yale University School of Medicine, New Haven, CT, USA