1. The University Hospital of Larissa, P.O. Box 1425, 41110 Larissa, Greece
2. A.H.E.P.A University Hospital, 54636 Thessaloniki, Greece
3. Emory University, Atlanta, GA 30322, USA
4. Yale University School of Medicine, New Haven, CT 06510, USA
5. Department of Cardiology and Pneumology, Charité-Universitätsmedizin Berlin, Campus Benjamin Franklin (CBF), Berlin, Germany