1. Department of Radiology and Nuclear Medicine, Zuoying Armed Forces General Hospital, Kaohsiung 813, Taiwan, R.O.C.
2. Division of Urology, Department of Surgery, Zuoying Armed Forces General Hospital, Kaohsiung 813, Taiwan, R.O.C.
3. Children's Medical Center, Taichung Veterans General Hospital, Taichung 407, Taiwan, R.O.C.
4. Department of Medical Education and Research, Kaohsiung Veterans General Hospital, Kaohsiung 813, Taiwan, R.O.C.
5. Department of Medical Research, Taichung Veterans General Hospital, Taichung 407, Taiwan, R.O.C.
6. Department of Medicine, MacKay Medical College, New Taipei City 252, Taiwan, R.O.C.