Date	Event	Description
6 July 2018	New citation required but conclusions have not changed	This is the third update of this review (Thomson 1999). In this update, we expanded the inclusion criteria to also include studies using other methods to identify opinion leaders than the four previously pre‐defined, and as a result, we included four studies that we had previously excluded. We conducted a new search and other content updated. There were changes to the author team, with two authors leaving. We updated the methods to comply with new EPOC and MECIR standards and added five summary of findings tables to the review.
3 July 2018	New search has been performed	New searches performed to July 2018. We added six new studies to this update. The total number of studies is now 24.The conclusions are unchanged.