[1] Univ Heart & Vasc Ctr Hamburg, Hamburg, Germany
[2] Karolinska Univ Hosp, Cardiol, Stockholm, Sweden
[3] Linkoping Univ, Dept Cardiol, Linkoping, Sweden
[4] Linkoping Univ, Dept Hlth Med & Caring Sci, Linkoping, Sweden
[5] Harvard Med Sch, Brigham & Womens Hosp, Dept Med, Boston, MA USA
[6] Univ Michigan, Dept Med, Ann Arbor, MI 48109 USA