Fig. 6

Map of collaboration between the author groups of included guidelines. Each individual circle represents one author of a guideline. Each ‘cluster’ represents the group of authors that developed one guideline. Each cluster is labelled with the names of its respective first author(s). Guidelines which share one or more authors between them are connected by grey lines, with single circles between guideline clusters representing the individuals who authored both guidelines in question. Guidelines were classified as “International” if they were developed either for multiple countries or did not specify to which countries they pertained. Guidelines for which author names were not reported have not been included in this figure. NICE, National Institute for Health and Clinical Excellence; SIGN, Scottish Intercollegiate Guidelines Network