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Rohmatin, S.L., Sakufa, A. and Widiarini, R. 2024. The Effectiveness of Giving 25% Green Betel Leaf Extract Formula (Piper Betle) in Reducing Germ Numbers on the Emergency Room Floor of RSU "X" Ponorogo Regency. Journal of Comprehensive Science (JCS). 3, 9 (Sep. 2024), 4421–4433. DOI:https://doi.org/10.59188/jcs.v3i9.1087.