[1] Univ Duisburg Essen, Univ Hosp, Inst Virol, Essen, Germany
[2] Inst Immunol & Genet, Kaiserslautern, Germany
[3] Heinrich Heine Univ, Univ Hosp, Inst Virol, Dusseldorf, Germany
[4] Univ Duisburg Essen, Univ Hosp, Dept Bone Marrow Transplantat, Essen, Germany
[5] Univ Med Ctr Utrecht, Med Microbiol, Utrecht, Netherlands
[6] Univ Cologne, Inst Virol, Cologne, Germany
[7] Univ Duisburg Essen, Univ Hosp, Dermatol Clin, Essen, Germany