1. Department of Thoracic Medicine and Laboratory of Molecular and Cellular Pneumonology, Interstitial Lung Disease Unit; University Hospital of Heraklion; Heraklion Greece
2. Department of Respiratory Medicine; General Hospital of Kavala; Kavala Greece
3. Respiratory Medicine and Semi-Intensive Therapy Unit, Respiratory Physiopathology and Pulmonary haemodynamics Services; San Giuseppe Hospital-Multimedica; Milan Italy