[1] Oslo Univ Hosp, Ctr Patient Ctr Heart & Lung Res, Dept Cardiothorac Surg, Div Cardiovasc & Pulm Dis, N-0450 Oslo, Norway
[2] Lovisenberg Diaconal Univ Coll, Dept Masters & Postgrad Studies, N-0456 Oslo, Norway
[3] Norwegian Univ Sci & Technol, Fac Med & Hlth Sci, Dept Hlth Sci Gjovik, N-2815 Gjovik, Norway
[4] Vilnius Univ, Fac Med, Inst Clin Med, Clin Cardiac & Vasc Dis, LT-03101 Vilnius, Lithuania
[5] Vilnius Univ, Santaros Clin, Clin Cardiac & Vasc Dis, Ctr Cardiol & Angiol, LT-08661 Vilnius, Lithuania
[6] Linkoping Univ, Dept Hlth Med & Caring Sci, S-58183 Linkoping, Sweden
[7] Linkoping Univ, Dept Cardiol, S-58183 Linkoping, Sweden
[8] Univ Oslo, Fac Med, Inst Hlth & Soc, N-0456 Oslo, Norway