1. Cardiology Clinic; Clinical Center of Serbia; Belgrade Serbia
2. School of Medicine; University of Belgrade; Belgrade Serbia
3. Institute of Cardiovascular Science; University of Birmingham; Edgbaston Birmingham UK
4. Department of Cardiology; Institution of Medical Science; Uppsala University; Uppsala Sweden
5. Intermountain Medical Center Heart Institute; Intermountain Medical Center; Murray UT USA
6. Department of Internal Medicine; Stanford University; Palo Alto CA USA