[1] Univ Hosp Cologne, D-50924 Cologne, Germany
[2] Univ Wurzburg, Wurzburg, Germany
[3] Univ Heidelberg, D-6900 Heidelberg, Germany
[4] Univ Tubingen, Tubingen, Germany
[5] Univ Hosp Munich, Munich, Germany
[6] Univ Hosp Mainz, Mainz, Germany
[7] Klinikum Schwabing, Munich, Germany
[8] Charite, D-13353 Berlin, Germany
[9] Univ Hosp Erlangen, Erlangen, Germany
[10] Kantonsspital, St Gallen, Switzerland
[11] Univ Hosp Kralovske Vinohrady, Prague, Czech Republic
[12] Charles Univ Prague, Prague, Czech Republic
[13] Masaryk Univ, Fac Med, Brno, Czech Republic
[14] Univ Hosp, Brno, Czech Republic
[15] Salzburg Univ, A-5020 Salzburg, Austria