1. Emeritus Member ICRP Main Commission, Honorary Research Fellow, Plymouth Marine Laboratory, Prospect Place, The Hoe, Plymouth, PL1 3DH, UK; e-mail: janpentreath@yahoo.co.uk
2. University of Kentucky, USA
3. Oregon State University, USA
4. University of Ghent, Belgium
5. Kitasato University School of Veterinary Medicine, Japan
6. Colorado State University, USA
7. American College of Veterinary Radiology, USA