1. Department of Clinical Laboratory, University of Tsukuba Hospital, Tsukuba, Japan.
2. Medical Science, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan.
3. Department of Cardiology, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan.
4. Master's Program in Medical Sciences, Graduate School of Comprehensive Human Sciences, University of Tsukuba, Tsukuba, Japan.
5. Department of Cardiology, Kamisu Clinical Education and Training Center, University of Tsukuba, Kamisu, Japan.