1. Department of Internal Medicine, Teikyo University School of Medicine, Tokyo 173-8605, Japan
2. Department of Clinical Laboratory Medicine, Graduate School of Medicine, The University of Tokyo, Tokyo 113-0033, Japan
3. Endowed Chairs Department of Clinical Research Medicine, Teikyo University, Tokyo 173-8605, Japan
4. Teikyo Academic Research Center, Teikyo University, Tokyo 173-8605, Japan