1. Department of Surgical Pathology; Aichi Medical University Hospital; 1-1 Yazakokarimata Nagakute Aichi 480-1195 Japan
2. Department of Pathology; Japanese Red Cross Nagoya Daini Hospital; 2-9 Myoken-cho, Showa-ku Nagoya Aichi 466-8650 Japan
3. Department of Pathology; National Institute of Infectious Diseases; 1-23-1 Toyama Shinjuku-ku Tokyo 162-8640 Japan