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Srithahai จ, Hinkhaw จ, Loysak บ. Effects of a Combination of Providing Knowledge and Reinforcement of operant Conditioning Theory on Preventing Behavior to Constipation and Constipation Rate among Students in Upper Elementary. bcnsurin [Internet]. 2021 Dec. 2 [cited 2022 Jun. 27];11(2):32-44. Available from: https://he01.tci-thaijo.org/index.php/bcnsurin/article/view/247486