[1] Linkoping Univ, Dept Cardiol, Linkoping, Sweden
[2] Linkoping Univ, Dept Med & Hlth Sci, Linkoping, Sweden
[3] Privathosp Molholm, Ctr Heart, Vejle, Denmark
[4] Dept Med & Hlth Sci, Electrophysiol Sect, Philadelphia, PA USA
[5] Skaraborgs Hosp, Dept Cardiol, Skovde, Sweden
[6] Orebro Univ, Fac Med & Hlth, Dept Cardiol, Orebro, Sweden
[7] Lund Univ, Dept Cardiol, Lund, Sweden