[1] Karolinska Inst, Dept Med, Div Cardiol, Stockholm, Sweden
[2] Karolinska Univ Hosp, Heart & Vasc Theme, Stockholm, Sweden
[3] Univ Utah, Dept Cardiovasc Med, Hlth Sci Ctr, Salt Lake City, UT USA
[4] Karolinska Inst, S1 02, S-17176 Stockholm, Sweden