[1] St Annes Univ Hosp, Int Clin Res Ctr, Cardiovasc Sleep Res Lab, Brno, Czech Republic
[2] Univ Hosp Brno, Dept Internal Med & Cardiol, Brno, Czech Republic
[3] Masaryk Univ, Fac Med, Brno, Czech Republic
[4] Mayo Clin & Mayo Fdn, Dept Internal Med, Div Cardiovasc Dis, Rochester, MN USA