1. Department of Cardiology, Leiden University Medical Center , Albinusdreef 2, 2333 ZA Leiden , The Netherlands
2. Department of Cardiology, National Heart Center Singapore, 5 Hospital Drive , Singapore 169609, Singapore , Singapore
3. Department of Cardiology, National University Heart Center Singapore , 5 Lower Kent Ridge Rd, Singapore 1190 74, Singapore
4. Department of Cardiology, Royal Perth Hospital , 197 Wellington St, Perth, WA 6000 , Australia
5. Department of Cardiology, Turku Heart Center, University of Turku and Turku Unviersity Hospital , Kiinamyllynkatu 4-8, 20521 Turku , Finland