Ninding P, Gultom A, Sembiring S, Dachi SS, Purba YA, Girsang VI. MAPPING PNEUMONIA IN TODDLERS: THE ROLE OF POPULATION DENSITY, SANITATION, AND HEALTH FACILITIES IN NORTH SUMATERA PROVINCE 2022-2023. PWH [Internet]. 17 Januari 2026 [dikutip 20 Januari 2026];7(1):1-13. Tersedia pada: http://e-journal.shj.ac.id/ojs/index.php/PWH/article/view/100