[1] Univ Frankfurt Klinikum, Med Klin 1, D-6000 Frankfurt, Germany
[2] Univ Klinikum Saarland, Anasthesiol Klin, Homburg, Germany
[3] Univ Klinikum Saarland, Klin Allgemeine Chirurg, Homburg, Germany
[4] Univ Klinikum Saarland, Inst Allgemeine & Spezielle Pathol, Homburg, Germany
[5] Univ Klinikum Saarland, Klin Innere Med 4, Homburg, Germany
[6] Univ Klinikum Saarland, Inst Virol, Homburg, Germany