The body mass index and the risk of ectopic pregnancy: a 5-year retrospective case-control study.

"Declarations Ethics approval and consent to participateResearch has been performed in accordance with the Declaration of Helsinki. The study was approved by the Ethics Committee of The Central Hospital of Wuhan, Affiliated Hospital of Huazhong University of Science and Technology (No. 2022WHZXKYL034). As this study is a retrospective study, it will not adversely affect the health of patients, nor will it involve the privacy and personal identity information of patients. The Ethics Committee of The Central Hospital of Wuhan, Affiliated with Hospital of Huazhong University of Science and Technology has waived the requirement of informed consent of patients. Consent for publicationNot applicable. Competing interestsThe authors declare no competing interests. Competing interests The authors declare no competing interests."

"Funding This work was supported by Project Health Commission of Hubei Province (WJ2021D006) , Project Health Commission of Wuhan City (WX20A05) and Electrophysiological Foundation of Chinese Association of Plastics and Aesthetics [2022]02015."