1. Department of Clinical Laboratory, Clinical Research Institute, National Hospital Organization Kyushu Medical Center, Fukuoka, Japan
2. Division of Hypertension, Clinical Research Institute, National Hospital Organization Kyushu Medical Center, Fukuoka, Japan
3. Graduate School of Medical Sciences, Department of Medicine and Clinical Sciences, Kyushu University, Fukuoka, Japan
4. Hypertension Center, Steel Memorial Yawata Hospital, Kitakyushu, Japan