1. Department of Histology and Embryology, Institute of Pathology and Pathophysiology, China Medical University, Shenyang, China;
2. Department of Biomedicine-Anatomy, Aarhus University, Aarhus, Denmark;
3. Key Laboratory of Medical Cell Biology, Ministry of Education, China Medical University, Shenyang, China; and
4. Institute of Nephropathology, China Medical University, Shenyang, China