Endoscopic Sphincterotomy before Fully Covered Metal Stent Placement Is Not Required for Distal Malignant Biliary Stricture due to a Pancreatic Head Tumor by Kazunari Nakahara, Yosuke Michikawa, Ryo Morita, Keigo Suetani, Nozomi Morita, Junya Sato, Kensuke Tsuji, Hiroki Ikeda, Kotaro Matsunaga, Tsunamasa Watanabe, Nobuyuki Matsumoto, Shinjiro Kobayashi, Takehito Otsubo, Fumio Itoh

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