How common is patient and public involvement (PPI)? Cross-sectional analysis of frequency of PPI reporting in health research papers and associations with methods, funding sources and other factors.
Iain LangAngela KingGeorgia JenkinsKate BoddyZohrah KhanKristin LiaboPublished in: BMJ open (2022)
Most research papers in our sample did not include PPI and PPI inclusion varied widely in relation to location, methods, topic and funding source.