1. St. George's University of London; London UK
2. Cardiology Clinic; School of Medicine; Clinical Centre of Serbia; University of Belgrade; Belgrade Serbia
3. Department of Electrophysiology; Herzzentrum Leipzig GmbH; Leipzig Germany
4. Department of Cardiology; Maastricht University Medical Centre and Cardiovascular Research Institute; Maastricht The Netherlands
5. Department of Cardiology; Institution of Medical Science; Uppsala University; Uppsala Sweden