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Bibliography:istex:F9139053FFD6D09FC7E4315B0D841A675D19CC3A
ark:/67375/HXZ-8QQQGK7D-H
Correspondence to A. M. El-Hassan, Department of Pathology, Faculty of Medicine, P.O. Box 102, Khartoum, Sudan.
ISSN:0035-9203
1878-3503
DOI:10.1016/0035-9203(91)90072-7