Ethics approval and consent to participate
This study was approved by the ethics committee of the Fujian Maternity and Child Health Hospital(NO.2021KLRD09042) and registered the study at Chinese Clinical Trial Registry on 13/12/2021 (Registration number: ChiCTR2100054293). We recruited patients attending the pre-assessment anaesthetic clinic and all participants gave written, informed consent. This manuscript adheres to the applicable CONSORT guidelines. The authors assert that all procedures contributing to this work comply with the ethical standards of the relevant national and institutional committees on human experimentation and with the Helsinki Declaration of 1975, as revised in 2008.