Efficacy and safety of Ojeok-san plus Saengmaek-san for gastroesophageal reflux-induced chronic cough: protocol for a pilot, randomized, double-blind, placebo-controlled trial by Yeon Hee Bhang, Kwan-Il Kim, Jaehyo Kim, Junmo Ahn, Hwan-Su Jung, Changsop Yang, Seok-Jae Ko, Youngmin Bu, Jae-Woo Park, Kyoung Sun Park, Hee-Jae Jung, Jun-Hwan Lee, Beom-Joon Lee

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