1. National Center for Scientific Research “Demokritos”, 60037 Athens, Greece
2. Department of Biology, University of Athens, 15784 Athens, Greece
3. Radiation and Environmental Biophysics Research Centre, 11143 Athens, Greece
4. Experimental Dermatology Unit, Department of Neuroscience, Karolinska Institute, 171 77 Stockholm, Sweden
5. The Science and Public Policy Institute, Institute for Healthful Adaptation, Falls Church, VA 22044, USA