National Survey Regarding the Management of Difficult Bile Duct Stones in South Korea gan Yoon Suk Lee, Tae Joo Jeon, Woo Hyun Paik, Dong-Won Ahn, Kwang Hyun Chung, Byoung Kwan Son, Tae Jun Song, Sung-Hoon Moon, Eaum Seok Lee, Jae Min Lee, Seung Bae Yoon, Chang Nyol Paik, Yun Nah Lee, Jin-Seok Park, Dong Wook Lee, Sang Wook Park, Hyung Ku Chon, Kwang Bum Cho, Chang Hwan Park, on behalf of the Committee of Policy and Quality Management in Korean Pancreatobiliary Association

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