A randomized, controlled clinical study of low-molecular-weight heparin improving pregnancy outcomes in PCOS women undergoing IVF: study protocol.

"Declarations Ethics approval and consent to participateInformed consent will be obtained from all patients, and protocols were approved by the Reproductive Medicine Ethics Committees of the International Peace Maternity and Child Health Hospital, School of Medicine, Shanghai Jiao Tong University, before any study procedures were done. Consent for publicationNot applicable. Competing interestsThe authors declare that they have no competing interests. Competing interests The authors declare that they have no competing interests."

"Funding This study was supported by Clinical Research Plan of SHCD (SHDC2020CR4094), Innovative Research Team of High-Level Local Universities in Shanghai (SHSMU-ZDCX20212200), Shanghai Hospital Development Center Foundation (SHDC22022303), and Clinical Research Plan of IPMCH (IPMCH2022CR1-03). They have no role in the design of the study, collection, analysis, and interpretation of data or writing of the manuscript."

"Trial registration ClinicalTrials.gov ChiCTR2000036527. Registered on August 24, 2020"