Tedros A. Ghebreyesus, Mitiku Haile, Asefaw Getachew, Tesfamariam Alemayehu, Karen H. Witten, Ambachew Medhin, Mekonnen Yohannes, Yemane Asgedom, Yemane Ye-ebiy
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Ghebreyesus et al. (1998) studied this question.