1. Department of General Medicine , Juntendo University Faculty of Medicine , Tokyo , Japan
2. Department of Clinical Laboratory , St Luke’s International Hospital , Tokyo , Japan
3. Division of General Medicine , Showa University Koto Toyosu Hospital , Tokyo , Japan
4. Department of Diagnostic and Generalist Medicine , Dokkyo Medical University Hospital , Tochigi , Japan
5. Postgraduate Clinical Training Center , Shimane University Hospital , Izumo City , Shimane , Japan
6. Department of Clinical Laboratory, Juntendo Tokyo Koto Geriatric Medical Center , Tokyo , Japan