1. Department of Diagnostic Radiology and Nuclear Medicine, Graduate School of Medicine, Tokyo Medical and Dental University, Tokyo 113-8519, Japan
2. Department of Molecular Endocrinology and Metabolism, Graduate School of Medicine, Tokyo Medical and Dental University, Tokyo 113-8519, Japan
3. Department of Nephrology, Tokyo Kyosai Hospital, Tokyo 153-8934, Japan
4. Department of Diagnostic Radiology, Ome Municipal General Hospital, Tokyo 198-0042, Japan