1. The 2nd Department of Internal Medicine; Shinshu University School of Medicine; Matsumoto Nagano 390 Japan
2. Division of Clinical Microbiology, Department of Medical Technology, School of Allied Medical Sciences; Shinshu University; Matsumoto Nagano 390 Japan
3. Central Clinical Laboratories; Shinshu University Hospital; Matsumoto Nagano 390 Japan
4. Department of Endoscopy; Shinshu University Hospital; Matsumoto Nagano 390 Japan