1. Department of Cardiology; University Clinical Hospital Center “Dr. Dragisa Misovic - Dedinje”; Belgrade Serbia
2. Clinical Research Unit; University of Milan-Bicocca and Istituto Auxologico Italiano; Meda Italy
3. Clinical Centre of Serbia; Cardiology Clinic; Belgrade Serbia
4. Clinica Medic; Department of Medicine and Surgery; University Milano-Bicocca; Milano Italy
5. IRCCS Multimedica; Milan Italy