World Endometriosis Society consensus on the classification of endometriosis - Johnson, Neil P.; Hummelshoj, Lone; Adamson, G. David; Keckstein, Jörg; Taylor, Hugh S.; Abrao, Mauricio S.; Bush, Deborah; Kiesel, Ludwig; Tamimi, Rulla; Sharpe-Timms, Kathy L.; Rombauts, Luk; Giudice, Linda C. (Human reproduction, 2017)