Tecirli 2014.

Methods	Double‐blinded (participant/outcome assessor), randomized clinical trial Sequence generation not described Follow‐up: 3 months
Participants	Participants: 60 women in university hospital in Ankara, Turkey Operation: radical mastectomy (with axillary lymph node dissection) Groups, size: 30/30 Age: not listed All female participants Comorbidities: not listed
Interventions	Group 1 (bupivacaine): intra‐op: intercostobrachial nerve was blocked with 10 cc 0.5% bupivacaine before being sectioned Group 2 (control): intra‐op: intercostobrachial nerve sectioned without blockage Adjuvants: none Immediate post‐op pain control: no difference
Outcomes	Continuous: VAS at 3 months Dichotomus: pain questionnaire at 3 months Other reported: analgesic consumption Adverse events: reported as none
Notes	Pain score ≥ 4 was accepted as pain Funding sources: no explanation of financial support Conflicts of interest: no conflict of interest statement given
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Sequence generation not explained
Allocation concealment (selection bias)	Unclear risk	Concealment of allocation not explained
Blinding of participants and personnel (performance bias) All outcomes	Unclear risk	Blinding of medical personnel not explained
Blinding of outcome assessment (detection bias) All outcomes	Unclear risk	Knowledge of outcome assessors not indicated
Incomplete outcome data (attrition bias) All outcomes	Low risk	All participants completed the follow‐up evaluation
Selective reporting (reporting bias)	Low risk	No subgroup analysis or selective reporting was noted
Null bias	Low risk	Quote: "this study shows that intercostobrachial nerve block is an effective method to reduce the chronic neuropathic pain development after a breast cancer surgery."