Text and Data Mining valid from 2018-06-14
Received: 25 January 2018
Accepted: 31 May 2018
First Online: 14 June 2018
: TG: is Bsc/public health, MPH in Epidemiology and Biostatistics, Lecturer at Department of Public health, College of Medicine and Health Sciences, Wolkite University, Wolkite, Ethiopia.
: Not applicable.
: The authors declare that they have no competing interests.
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