Cipolla 2010.

Study characteristics
Methods	Study design: prospective randomised controlled trial Randomisation technique: not reported Allocation concealment: inadequately reported Inclusion criteria: well explained Exclusion criteria: well explained Lost to follow‐up: not mentioned Baseline variables: matching between both limbs of the trial Intention‐to‐treat analysis: not reported Sample size calculations (power of the study): not reported
Participants	Country: Italy Number of participants: FG: 80 and NFG: 79 Mean age (years): FG 59.1 ± 13.93; NFG 58.8 ± 10.8
Interventions	FG: Tissucol® was applied under skin flaps following breast and axillary surgery Types of surgical intervention: modified radical mastectomy quadrantectomy Confounding interventions: none
Outcomes	Primary: mean duration of axillary drainage Secondary: mean total drainage volume mean seroma aspirate volume mean number of seroma aspirations wound infection postoperative complications incidence of seroma complications
Notes
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	High risk	Not reported
Allocation concealment (selection bias)	High risk	Not reported
Blinding of participants and personnel (performance bias) All outcomes	High risk	Not reported
Blinding of outcome assessment (detection bias) All outcomes	High risk	Not reported
Incomplete outcome data (attrition bias) All outcomes	High risk	Not reported
Selective reporting (reporting bias)	Low risk	No
Other bias	Low risk	Inclusion, exclusion criteria, ethics approval and conflict of interest declaration was adequately reported