Z.Z.N.Y. was a member of the guideline development group for the British Association of Dermatologists guidelines for biological therapy for psoriasis; he was not involved in the critical appraisal of the guideline he coauthored. C.F. is a section editor while C.-C.C. and Z.Z.N.Y. are associate editors of the British Journal of Dermatology. The remaining authors declare they have no conflicts of interest.
Data availability statement:The data that support the findings of this study are available in Appendix S1 and S2 (see Supporting Information).