1. Ultrasound Section, Department of Radiology, The M.S. Hershey Medical Center, The Penn State Geisinger Health System, Hershey, Pennsylvania; Department of Radiology, The M.S. Hershey Medical Center, The Penn State Geisinger Health System, P.O. Box 850, 500 University Drive, Hershey, PA 17033
2. Ultrasound Section, Department of Radiology, The M.S. Hershey Medical Center, The Penn State Geisinger Health System, Hershey, Pennsylvania