Table 3.

Categories of author.

Category	Role
1. Core writing team	One or two lead authors who create the full draft
2. Wider internal research team	Make wider contributions, including to data collection, analysis, and commenting
3. Lived Experience Advisory Panel (LEAP)	Our larger studies all have a dedicated LEAP comprising 10 individuals with relevant lived experience, who work with us to ensure that lived experience informs every stage of our studies from design to dissemination. For most papers we identify two LEAP members to be co-authors. To note, other types of outputs such as chapters [30] and booklets [31] are led by the LEAP
4. International Advisory Board (IAB)	Our larger studies also all have an International Advisory Board (IAB) typically comprising 6 to 10 thought leaders from across the world, to ensure we are collaborating with best-in-field researchers. One advantage of having international authors is the increase in citation of the paper [32]
5. Specific experts	We may contact a specific world-leading expert to request their input in exchange for co-authorship, which has proved a valuable mechanism for developing new collaborations. Or we may involve a topic-specific expert to sense check the paper, e.g., a peer support worker (PSW) co-author in our global mental health PSW study [33]