1. Cardiology department; University Clinical Hospital Centre “Dr. Dragisa Misovic”; Belgrade Serbia
2. Clinical Research Unit; University of Milan-Bicocca and Italian Institute for Auxology; Meda Italy
3. Dobney Hypertension Centre, School of Medicine and Pharmacology-Royal Perth, Hospital Unit; The University of Western Australia; Perth Australia
4. Department of Echocardiography; Royal Brompton Hospital; London United Kingdom