1. Department of Medical Physics Centro di Riferimento Oncologico di Aviano (CRO) IRCCS Aviano PN 33081 Italy
2. Department of Radiation Oncology University of Michigan Ann Arbor MI 48103USA
3. Guerbet SA Villepinte France
4. Medical Physics Unit McGill University Montreal QC Canada
5. Department of Radiation Oncology University of California, San Francisco San Francisco CA 94143USA
6. Department of Computational Medicine & Bioinformatics University of Michigan Ann Arbor MI 48103USA
7. Department of Radiology Stanford University Stanford CA 94305USA