Br Sembiring, Emelia, Masdalena Masdalena, and Juliana Lina. 2025. “ubungan eak xpiratory low ate PEFR) engan ualitas idur ada asien POK i umah akit aru rovinsi umatera tara”. urnal romotif reventif 8 (5), 1173-82. https://doi.org/10.47650/jpp.v8i5.2272.