[1] Rikshospitalet, Inst Surg Res, Div Cardiovasc & Pulm Dis, Oslo Univ Hosp, POB 4950 Nydalen, NO-0424 Oslo, Norway
[2] Univ Oslo, POB 4950 Nydalen, NO-0424 Oslo, Norway
[3] Univ Ghent, Dept Cardiol, Ghent, Belgium
[4] Ghent Univ Hosp, Ghent, Belgium