1. Laboratory of Biology, Department of Basic Medical Sciences, Medical School, National and Kapodistrian University of Athens, 11527 Athens, Greece
2. Department of Periodontology, School of Dentistry, National and Kapodistrian University of Athens, 11527 Athens, Greece
3. School of Science and Technology, Hellenic Open University, 26335 Patra, Greece
4. Greece Biomedical Research Foundation, Academy of Athens, 11527 Athens, Greece