Evans M R, Etuaful S N, Amofah G, Adjei O, Lucas S, Wansbrough-Jones M H
Department of Medicine, School of Medical Sciences, University of Science and Technology, Kumasi, Ghana.
Trans R Soc Trop Med Hyg. 1999 Jan-Feb;93(1):63-4. doi: 10.1016/s0035-9203(99)90181-5.