Implementation status of household contact tuberculosis screening by health extension workers: assessment findings from programme implementation in Tigray region, northern Ethiopia von Gebretnsae, Hailay, Ayele, Brhane Gebrekidan, Hadgu, Tsegay, Haregot, Esayas, Gebremedhin, Aregay, Michael, Eyassu, Abraha, Mebrahtu, Datiko, Daniel G, Jerene, Degue

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