ISBN-13: 9783639297669 / Angielski / Miękka / 2010 / 60 str.
Mr.Berhe Weldearegawi Sahle has BSc in Environmental Health Science,from Hawassa Univesity,Ethiopia; Masters of Public Health (MPH)from University of Gondar, Ethiopia.He is lecturer in the Department of Public Health, Mekelle University, Ethiopia.
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