He, ChuqingHe, XiaoqingLiang, YanSun, TaotaoYan, LiZhu, ChenfengZhao, XiaoyaXie, LiMol, Ben W.Zhang, JianHuirne, J. A.F.2021-10-062021-10-062021-08-30He, C, He, X, Liang, Y, Sun, T, Yan, L, Zhu, C, Zhao, X, Xie, L, Mol, B W, Zhang, J & Huirne, J A F 2021, 'Comparing levonorgestrel intrauterine system versus hysteroscopic resection in patients with postmenstrual spotting related to a niche in the caesarean scar (MIHYS NICHE trial) : Protocol of a randomised controlled trial', BMJ Open, vol. 11, no. 8, e045770. https://doi.org/10.1136/bmjopen-2020-0457702044-6055Jisc: 99be754fd7364bb9ae8e4cae30c6a9cbhttps://hdl.handle.net/2164/17283Funding This work was supported by National Key Research and Development Programme (2018YFC1002102), Research Project of Shanghai Health and Fitness Commission (201940012,20184Y0344)),Shanghai Municipal Key Clinical Specialty (shslczdzk01802), Medical Engineering Cross Funds from Shanghai Jiao Tong University (YG2017QN38, ZH2018QNA36, YG2021ZD31), Medical innovation research project of the 2020 'Science and Technology Innovation Action Plan' of Shanghai Science and Technology Commission (20Y11907700), and Clinical Science and Technology Innovation Project of Shanghai Hospital Development Center(SHDC22020216).7683516enggynaecologyradiology & imagingsurgeryR MedicineGeneral MedicineRJournal article10.1136/bmjopen-2020-045770http://www.scopus.com/inward/record.url?scp=85114380968&partnerID=8YFLogxK118