1. Cytel Incorporated, 1050 Winter St, Waltam, MA 02452, USA
2. Department of Radiation Oncology, Stanford University School of Medicine, Palo Alto, CA 94305, USA
3. Department of Occupational Health & Safety, Federal Ministry of Defense, 53123 Bonn, Germany
4. Department of Nuclear Medicine, University Medical Center, Johannes Gutenberg University in Mainz, 55101 Mainz, Germany
5. Department of Nuclear Medicine, University of Ankara, Ankara 06100, Turkey
6. Department of Nuclear Medicine, University Hospital in Innsbruck, 6020 Innsbruck, Austria
7. Department of Nuclear Medicine, Hacettepe University, Ankara 06230, Turkey
8. Department of Nuclear Medicine, Incept, Institute Holland, 38100 Grenoble, France
9. Center of Tobacco Control Research, 5320 Odense, Denmark