[1] MED UNIV S CAROLINA, DEPT MICROBIOL & IMMUNOL, CHARLESTON, SC 29425 USA
[2] MED UNIV S CAROLINA, DEPT UROL, CHARLESTON, SC 29425 USA
[3] MED UNIV S CAROLINA, DEPT MED, CHARLESTON, SC 29425 USA
[4] CATHOLIC UNIV LEUVEN, EXPTL GENEESKUNDE LAB, B-3000 LOUVAIN, BELGIUM
[5] STELLENBOSCH MED SCH, DEPT INTERNAL MED, CAPE TOWN, SOUTH AFRICA