This set of guidelines has been developed using the BAD recommended methodology with reference to the Appraisal of Guidelines Research and Evaluation (AGREE II) instrument (www.agreetrust.org). Recommendations were developed for implementation in the U.K. National Health Service (NHS) using a process of considered judgement based on the evidence. The PubMed, MEDLINE, Embase and LILACS databases were searched for PV from January 2000 up to May 2016; the search terms and strategies are detailed in Appendix S1 (see Supporting Information). Additional relevant references were also isolated from citations in the reviewed literature. All identified titles were screened, and those relevant for first-round inclusion were selected for further scrutiny. The abstracts for the shortlisted references were then reviewed by the GDG and the full papers of relevant material obtained; disagreements in the final selections were resolved by discussion with the entire GDG. The structure of the 2003 guidelines was then discussed and re-evaluated, with headings and subheadings decided; different coauthors were allocated separate subsections. Each coauthor then performed a detailed appraisal of the selected literature, with discussions within the GDG to resolve any issues. All subsections were subsequently collated, circulated within the GDG and edited to produce the final guidelines.
The British Journal of Dermatology. 2017;177(5):1170-1201. © 2017 Blackwell Publishing