[1] Department of Pathology and Laboratory Medicine,
[2] University of Wisconsin,undefined
[3] Madison,undefined
[4] WI 53706,undefined
[5] USA e-mail: ehrmeyer@facstaff.wisc.edu Tel.: +608-262 0859 Fax: +608-262 9520,undefined
[6] Department of Preventive Medicine,undefined
[7] Department of Pathology and Laboratory Medicine,undefined
[8] University of Wisconsin,undefined
[9] Madison,undefined
[10] Wis.,undefined
[11] USA,undefined