1. Department of Radiation Oncology, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania.
2. Department of Otorhinolaryngology-Head and Neck Surgery, Turku University Hospital, Turku, Finland.
3. Turku PET Centre, Turku University Hospital, Turku, Finland.
4. Radiation Dosimetry Systems, Alpharetta, Georgia.
5. Departments of Oncology and Radiotherapy, Turku University Hospital, Turku, Finland.
6. Departments of Radiology, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania.
7. Varian Medical Systems, Palo Alto, California.
8. Department of Radiology and Radiological Sciences, Vanderbilt University, Nashville, Tennessee.