Efficacy and safety of short-term therapy with indigo naturalis for ulcerative colitis: An investigator-initiated multicenter double-blind clinical trial. by Kan Uchiyama, Shinichiro Takami, Hideo Suzuki, Kiyotaka Umeki, Satoshi Mochizuki, Nobushige Kakinoki, Junichi Iwamoto, Yoko Hoshino, Jun Omori, Shunji Fujimori, Akinori Yanaka, Yuji Mizokami, Toshifumi Ohkusa

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