Author contributions
All authors approved the final version of the study. Study design: CLC, PL, LW, JHL. Literature search: PFL, JQL, ZQL. Figures: PFL,JQL. Data analysis: CLC, PFL, XNB,. Data interpretation: All authors. Data collection: PFL, ZQL. Drafting of the manuscript: PFL, JQL. Obtained funding: CLC. Supervision: CLC, LW, PL, JHL.
Funding : This study was funded by The National Science and Technology Support Program of China (2014BAI05B03), the National Natural Science Fund of Guangdong (2015A030311024), the Science and Technology Plan of Guangzhou (158100075).
Competing interests : All authors have completed the ICMJE uniform disclosure form atwww.icmje.org/coi_disclosure.pdf; no financial relationships with any organizations that might have an interest in the submitted work; and all authors have no conflicts of interest to disclose.
Ethical approval : The establishment of the clinical diagnosis and treatment for cervical cancer in mainland China (Four C) database was approved by the Ethics Committee of the Southern Hospital of Southern Medical University. The ethical approval number is NEEC-2017-135, and the clinical research registration number is CHiCTR1800017778 (International Clinical Trials Registry Platform Search Port,http://apps.who.int/trialsearch/).
Data sharing : Additional data available from the corresponding author at ccl1@smu.edu.cn. The lead author (CC) affirms that this manuscript is an honest, accurate, and transparent account of the study being reported; that no important aspects of the study have been omitted; and that any discrepancies(and, if relevant, registered) from the study as planned have been explain.