Implementation fidelity of Ethiopia’s Malaria test-and-treat guideline amid a resurgence in Amhara Region: A mixed-methods study - Mastewal Worku Lake; Kassahun Alemu Gelaye; Mulusew Andualem Asemahagn; Kindie Fentahun Muchie; Hailemariam Awoke Engedaw; Muluken Azage Yenesew (PLoS ONE, 2026)