[1] Hannover Med Sch, Dept Gastroenterol Hepatol & Endocrinol, D-3000 Hannover, Germany
[2] Twincore, Dept Expt Virol, Hannover, Germany
[3] Hannover Med Sch, D-3000 Hannover, Germany
[4] Helmholtz Ctr Infect Res, Hannover, Germany
[5] Hannover Med Sch, Dept Visceral & Transplant Surg, D-3000 Hannover, Germany