1Onassis Cardiac Surgery Center, Pulmonary Hypertension Unit, Athens, Greece
2Attikon University Hospital, Pulmonary Hypertension Clinic, Athens, Greece
34th Department of Internal Medicine, Hippokration Hospital, Thessaloniki, Greece
4AHEPA University General Hospital, Pulmonary Hypertension Unit, Thessaloniki, Greece
5Rheumatology and Clinical Immunology Unit, "Attikon" University Hospital, Athens, Greece
6Department of Thoracic Medicine, Faculty of Medicine, University of Crete, Crete, Greece
7Department of Cardiology, Larissa University Hospital, Larissa, Greece
8Rheumatology Clinic, Department of Internal Medicine, Medical School, University of Ioannina, Ioannina, Greece
9First Department of Propaedeutic Internal Medicine and Rheumatology Unit, Medical School, National and Kapodistrian University of Athens, Athens, Greece