1. Department of General Surgery, John Hopkins Hospital, MD, USA
2. Department of Internal Medicine, Nassau University Medical Center, East Meadow, NY 11554, USA
3. Department of Urology, University of Texas MD Anderson Cancer Center, Houston, TX, USA
4. Department of Biostatistics, University of Texas MD Anderson Cancer Center, PO Box 301402 Houston, TX 77230-1402, USA
5. Research Medical Library, University of Texas MD Anderson Cancer Center, Houston, TX 77230-1402, USA
6. Anesthesia & Surgical Oncology Research Group, Houston, TX 77030, USA