Korean colonoscopy screening pilot study (K-cospi) for screening colorectal cancer: study protocol for the multicenter, community-based clinical trial Bằng Bomi Park, Jae Kwan Jun, Byung Chang Kim, Kui Son Choi, Mina Suh, The Expert Advisory Committee, The Monitoring Committee, Center for Korean Colonoscopy Screening Pilot Study, The Research Team on the Protocol Development of Pilot study

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