1. ASELL, LLC, Owings Mills, Maryland
2. Columbia University, Center for Radiological Research, New York, New York
3. MetaSystems, GmbH, 68804 Altulussheim, Germany
4. Wake Forest School of Medicine, Departments of Radiation Oncology, Physics, and Biomedical Engineering, Winston-Salem, North Carolina
5. Helix3, Inc., Morrisville, North Carolina
6. Lovelace Biomedical Research Institute, Albuquerque, New Mexico