[1] Inst Clin & Expt Med, Dept Cardiac Surg, Prague, Czech Republic
[2] Charles Univ Prague, Fac Med 3, Prague, Czech Republic
[3] Univ Hosp Motol, Fac Med 2, Dept Neurol, Prague, Czech Republic
[4] Charles Univ Prague, Fac Med 1, Dept Cardiovasc Surg, Dept Surg 2, Prague, Czech Republic