Health information system in primary health care units of the Central Zone, Tigray, Northern Ethiopia. - Letekirstos Gebreegziabher Gebretsadik; Abate Bekele Belachew; Gebregziabher Berihu Gebrekidan; Alemayohu Bayray; Akberet Lemlem; Lewtnesh Berihun Dangew; Haftom T. Abebe (BMC Medical Informatics Decis. Mak., 2025)