[1] Univ Illinois, Hematol Oncol Sect, Chicago, IL 60607 USA
[2] W Side VA Hosp, Chicago, IL 60607 USA
[3] Univ Toronto, Dept Med Genet & Microbiol, Toronto, ON M5S 3E2, Canada
[4] Univ Tennessee, Dept Pathol, Memphis, TN 38163 USA
[5] Univ Gottingen, Abt Kardiol, Gottingen, Germany
[6] Med Hsch Hannover, Inst Virol & Seuchen Hyg, Hannover, Germany