Heemskerk‐Gerritsen 2015a.

Methods	Partly retrospective and prospective cohort study, matching design
Participants	Country: Netherlands Enrolled: 146 surgical participants and 576 control participants Women with BRCA1 or BRCA2 mutation carriers
Interventions	Arm A: RRSO Arm B: general surveillance or non‐RRSO
Outcomes	Ovarian cancer mortality Breast cancer mortality Ovarian cancer incidence Breast cancer incidence
Notes
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	See Table 7