1. Department of Clinical Laboratory Science, Faculty of Medical Technology, Teikyo University, Itabashi, Tokyo 173-8605, Japan
2. Center for Medical Education, Faculty of Medicine, Toho University, Ota, Tokyo 143-8540, Japan
3. Department of Internal Medicine, Tokyo Metropolitan Bokutoh Hospital, Sumida, Tokyo 130-8575, Japan
4. Department of Medicine III, Faculty of Medicine of the Technische Universität Dresden, Dresden 01307, Germany