1. Institute of Anatomy and Cell Biology, School of Medicine, Zhejiang University, Hangzhou, China
2. Department of Pathology, Graduate School of Medicine and Pharmaceutical Sciences for Research, University of Toyama, 2630 Sugitani Toyama, Toyama 930-0194, Japan
3. Department of Radiological Sciences, Graduate School of Medicine and Pharmaceutical Sciences for Research, University of Toyama, Toyama, Japan