1. Imaging Institute, Abdominal Imaging Section, Cleveland Clinic, 9500 Euclid Ave, Mail Code JB-3, Cleveland, OH 44195.
2. CDPI Clinic, DASA, Rio de Janeiro, Brazil.
3. Department of Quantitative Health Sciences, Cleveland Clinic, Cleveland, OH.
4. Universidade Federal de Santa Maria, Rio Grande do Sul, Brazil.
5. Glickman Urological and Kidney Institute, Cleveland Clinic, Cleveland, OH.