[1] Univ Bologna, S Orsola Malpighi Univ Hosp, Dept Expt Diagnost & Specialty Med, Inst Cardiol, I-40138 Bologna, Italy
[2] Univ Birmingham, Ctr Cardiovasc Sci, City Hosp, Birmingham B18 7QH, W Midlands, England
[3] Univ Hosp Bern, Dept Cariol, CH-3010 Bern, Switzerland
[4] Wilhelminenhosp, Dept Med Cardiol & Intens Care Med 3, A-1160 Vienna, Austria
[5] Univ Birmingham, Cardiol Sci Ctr, Birmingham, W Midlands, England
[6] SWBH NHS Trust, Birmingham, W Midlands, England
[7] Univ Klinikum Munster, Dept Cardiol & Angiol, D-48149 Munster, Germany