1. Department of Radiology, Sloan Kettering Institute for Cancer Research, 1275 York Ave., Z-2001, New York, NY 10065, USA. Fax: +1 (646)-888-3059; Tel: +1 (646)-888-3373
2. Department of Surgery, Sloan Kettering Institute for Cancer Research, New York, NY 10065, USA
3. Quest Medical Imaging B.V., Middenmeer, The Netherlands NL-1775PW
4. Department of Materials Science & Engineering, 330 Bard Hall, Cornell University, Ithaca, NY 14853, USA