[1] Univ Hosp Essen, Klin & Poliklin Kardiol, Essen, Germany
[2] Univ Hosp Essen, Abt Thorax & Kardiovask Chirurg, Essen, Germany
[3] Univ Hosp Essen, Inst Diagnost & Internvent Radiol, Essen, Germany
[4] Univ Hosp Essen, Abt Anasthesiol & Intens Med, Essen, Germany