1. Laboratory of Human Pathophysiology, Faculty of Nursing, University of Thessaly, 415 00 Larissa, Greece
2. Department of Biochemistry, University of Thessaly, 415 00 Larissa, Greece
3. Department of Respiratory Medicine, University of Thessaly, 415 00 Larissa, Greece
4. Faculty of Nursing, University of Thessaly, 415 00 Larissa, Greece
5. Department of Immunology, Tufts University School of Medicine, Boston, MA 02111, USA