[1] Department of Chemical Pathology,
[2] Institute of Pathology,undefined
[3] University of Pretoria,undefined
[4] P.O. Box 2034,undefined
[5] Pretoria 0001,undefined
[6] South Africa e-mail: ddhatt@postillion.up.ac.za Tel.: +27-12-319 2114 Fax: +27-12-328 3600,undefined
[7] South African National Accreditation System,undefined
[8] CSIR Campus,undefined
[9] Lynnwood Ridge,undefined
[10] Pretoria 0040,undefined
[11] South Africa,undefined