[1] Univ Oslo, Rikshosp, Oslo Univ Hosp, Dept Cardiol, N-0027 Oslo, Norway
[2] Norwegian Univ Sci & Technol, Dept Circulat & Med Imaging, N-7034 Trondheim, Norway
[3] Univ Oslo, Rikshosp, Oslo Univ Hosp, Rsch Inst Internal Med, N-0027 Oslo, Norway
[4] Norwegian Sch Sport Sci, NIH, Oslo, Norway
[5] Univ Oslo, Rikshosp, Oslo Univ Hosp, Div Surg & Neurosci, N-0027 Oslo, Norway
[6] Univ Oslo, Rikshosp, Oslo Univ Hosp, Dept Clin Serv, N-0027 Oslo, Norway
[7] Univ Oslo, Rikshosp, Oslo Univ Hosp, Dept Cardiothorac Surg, N-0027 Oslo, Norway