Figure 1.

— PRISMA flow diagram for the selection of studies describing endometriosis classification, staging and reporting systems.

1 The recent paper on #ENZIAN was included, although published after the inclusion deadline.

2 Non-English language studies, animal studies and papers not focusing on endometriosis.

3 Exclusion criteria included: Full text not able to be retrieved (n=9); Publication types [case report, expert opinion, editorial] (n=28);

Relevant patients are not included [not endometriosis] (n=2); Relevant intervention/outcomes are not assessed [not on classification] (n=35); Irrelevant (n=6); Not English (n=4).