PATIENT SELECTION A. Risk of bias
Describe methods of patient selection:
a) Was a consecutive or random sample of patients enrolled?	Yes/No/Unclear
b) Was a case‐control design (using healthy controls) avoided?	Yes/No/Unclear
c) Did the study avoid inappropriate exclusions? a) include all ages and regardless of menopausal status or justify restrictions b) include all stages of ovarian cancer c) include comorbidities such as infertility and endometriosis	Yes/No/Unclear
Could the selection of patients have introduced bias? Low: a) and b) and c) 'YES' High: a) or b) or c) 'NO' Unclear: not 'High' and a) or b) or c) 'UNCLEAR'	RISK: LOW/HIGH/UNCLEAR