Laboratory for Microscopy and Microanalysis, University of Pretoria (UP)), A Stander, D Crafford and S Marais (Department of Physiology, UP) for technical assistance, Ms B English ,
Funding of this research is gratefully acknowledged from the following: The Cancer Association of South Africa (CANCA) (AOS201), the Medical Research Council, MRC) for statistics consultationMRC) (AOS536), the National Research Foundation (NRF) (AOT060) The Research Committee of the University of Pretoria (RESCOM) (AOR984), South African Medical Association (SAMA) and the Research Development Programme (UP) (AOV8410) ,
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