Priorities for methodological research on patient and public involvement in clinical trials: A modified Delphi process.

Background: Despite increasing international interest, there is a lack of evidence about the most efficient, effective and acceptable ways to implement patient and public involvement (PPI) in clinical trials.

Objective: To identify the priorities of UK PPI stakeholders for methodological research to help resolve uncertainties about PPI in clinical trials.

Design: A modified Delphi process including a two round online survey and a stakeholder consensus meeting.