[1] Hannover Med Sch, Dept Gastroenterol Hepatol & Endocrinol, Hannover, Germany
[2] Friedrich Loeffler Inst, Inst Farm Anim Genet, Mariensee, Germany
[3] Helmholtz Ctr Infect Res, Dept Expt Immunol, Braunschweig, Germany
[4] Hannover Med Sch, Integrated Res & Treatment Ctr, Transplantat IFB Tx, Hannover, Germany