1 7th Dept of Pneumonology, Hospital for Chest Diseases "Sotiria", Athens, Greece.
2 Universitätsklinik, Essen, Germany.
3 1st Dept of Pneumonology, Medical School, National and Kapodistrian University of Athens, Hospital for Chest Diseases "Sotiria", Athens, Greece.
4 1st Dept of Pneumonology, Medical School, National and Kapodistrian University of Athens, Hospital for Chest Diseases "Sotiria", Athens, Greece debouros@med.uoa.gr.