1. Department of Applied Physics, Columbia University, 200 SW Mudd Building, New York, New York 10027
2. Department of Medicine, Columbia University Medical Center, 630 West 168th Street, New York, New York 10032
3. Department of Surgery, Columbia University Medical Center, 630 West 168th Street, New York, New York 10032
4. Department of Radiology, Columbia University, 710 West 168th Street, New York, New York 10032