Association of the second birth mode of delivery and interval with maternal pelvic floor changes: a prospective cohort study.

"Declarations Ethical approvalAll procedures were performed in accordance with the ethical standards laid down in the 1964 Declaration of Helsinki and its later amendments. The study was approved by the Medical Ethics Committee of Panzhihua Central Hospital (approval number: 20170002). All participants signed the written informed consent form. The study was carried out in accordance with the applicable guidelines and regulations. Consent for publicationNot applicable. Competing interestsThe authors have no relevant financial or non-financial interests to disclose. Competing interests The authors have no relevant financial or non-financial interests to disclose."

"Funding This study was supported by the Panzhihua Municipal Scientific Research Project of 2018 Panzhihua Municipal Science and Technology and Intellectual Property Office (No. 2018CY-S-11). The funders played no role in the design, conduct, or reporting of this study."