Efficacy of linaclotide in combination with polyethylene glycol for bowel preparation in Chinese patients undergoing colonoscopy polypectomy: protocol for a randomised controlled trial - Jing Xu; Ping-ping Chen; Dong Chen; Hui-Ying Zhao; Xiao-Feng Cai; Xiao-Bin Wang; Chao-Xu Liu (BMJ Open, 2024)