Hwang 2016.

Methods	Retrospective questionnaire
Participants	7619 volunteers from Army of Women aged ≥ 18 years with reported history of BC surgery completed survey; 1598 (21%) reported CRRM and 2379 (31%) reported no CRRM but treatment mastectomy only 3470 (46%) reported BCS and were excluded 87.3% had CRRM at time of initial treatment and 10.5% had CRRM at time of recurrence or new primary diagnosis
Interventions	CRRM
Outcomes	QoL
Notes
Risk of bias
Bias	Authors' judgement	Support for judgement
Free of selection bias?	High risk	Cohort recruited through a call‐to‐action email sent to all Army of Women members from AOW, (relatively affluent, well‐educated population who join AoW)
Free of performance bias?	High risk	CRRM only self‐reported, no medical record data
Free of detection bias?	Low risk	Used validated questionnaires (BREAST‐Q) administered electronically
Free of attrition bias?	Low risk	All women who volunteered to complete surveys did so