1. Department of Molecular Biology and Genetics, Democritus University of Thrace, Alexandroupolis, Greece
2. Laboratory of Molecular Virology, Hellenic Pasteur Institute, Athens, Greece
3. Laboratory of Medical Biology, Department of Medicine, Democritus University of Thrace, Alexandroupolis, Greece
4. Department of Internal Medicine, Medical School of Athens, Hippokration Hospital Athens, Greece
5. First Department of Internal Medicine, Democritus University of Thrace, Alexandroupolis, Greece
6. Medizinische Klinik 1, Universitätsklinikum Frankfurt, Frankfurt am Main, Germany