1. Institute of Industrial Science, The University of Tokyo, Tokyo 153-8505, Japan
2. Department of Mechanical Engineering, School of Engineering, Tokai University, Kanagawa 259-1292, Japan
3. Department of Nephrology and Endocrinology, Graduate School of Medicine, The University of Tokyo, Tokyo 113-0033, Japan
4. Center for Polycystic Kidney Disease Research and Renal Division, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts 02115, USA