Data management, control of data consistency, and quality control
To protect patient privacy, the investigator or designated representative is required to enter all information required into the electronic case report form after anonymisation. Automatic checks for data completeness, validity, and consistency were performed using the data capturing system of WJOG. The investigator or designated representative is obliged to clarify or respond to any queries generated. Each dataset is checked for errors or inconsistencies before creating a comprehensive dataset. Data access is limited to the authors and research assistants of the WJOG research team.