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Table 3 Nine key considerations for COS developers undertaking multi-language Delphi surveys

From: Methods for conducting international Delphi surveys to optimise global participation in core outcome set development: a case study in gastric cancer informed by a comprehensive literature review

1 International working group To ensure that study and its aims are promoted in regions from where the study team wish to target recruitment.
2 Patient and public involvement To ensure that the patient perspective is represented.
3 Who should undertake the translation work? Deciding whether to employ professionally paid services or identify clinically trained individuals to undertake the translations.
4 Milestone and timeline planning Providing a pre-agreed timetable for translation work and checks ahead of recruitment to the Delphi survey.
5 Recruitment and retention targets Planning how long to keep Delphi survey rounds open to ensure an appropriate number of participants have been recruited.
6 Paper and Internet-based survey versions Giving stakeholders without easy access to the Internet an opportunity to participate in the study.
7 Measures to maximise recruitment Dissemination strategy
Local recruitment
Support from stakeholder group and research networks
Collaborations
Personalised e-mails
Social media and multimedia
8 Ethical approval Identifying what type of approvals are required as these vary between regions.
9 Financial planning Ensuring that a robust plan for resource allocation is made in advance.