Zekeng, L.; Gurtler, L.; Ze, E. Afane; Sam-Abbenyi, A.; Mbouni-Essomba, G.; Mpoudi-Ngolle, E.; Monny-Lobe, M.; Tapko, J. B.; Kaptue, L. Author Information
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Zekeng et al. (1994) studied this question.