[1] UNIV WISCONSIN, WISCONSIN STATE LAB HYG, MADISON, WI 53706 USA
[2] UNIV WISCONSIN, DEPT MED MICROBIOL & IMMUNOL, MADISON, WI 53706 USA
[3] UNIV WISCONSIN, CTR COMPREHENS CANC, FLOW CYTOMETRY UNIT, MADISON, WI 53706 USA
[4] GUNDERSON MED FDN, LA CROSSE, WI 54601 USA