Different Regimens of Polyethylene Glycol Electrolyte Solution in Bowel Preparation before Colonoscopy for Elderly Patients：a Randomized Controlled Study　
LIU Miao，WANG Hongbo，CHEN Qingbo
Chinese General Practice . 2019, (12): 1432 -1435 .  DOI: 10.12114/j.issn.1007-9572.2018.00.226

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