Health information system in primary health care units of the Central Zone, Tigray, Northern Ethiopia by Letekirstos Gebreegziabher Gebretsadik, Abate Bekele Belachew, Gebregziabher Berihu Gebrekidan, Alemayohu Bayray, Akberet Lemlem, Lewtnesh Berihun Dangew, Haftom Temesgen Abebe

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