Bae 2014

Methods	Parallel RCT
Participants	Country of study: South Korea Setting: laboratory Condition: CPSP Prior management details: not reported n = 14 Age, mean (SD): active group 51.1 (3.1) years, sham group 52.3 (2.8) years Duration of symptoms, mean (SD): active group 14.5 (3.2) months, sham group 14.7 (2.7) Gender distribution: 7 M, 7 F
Interventions	Stimulation type: tDCS Stimulation parameters: intensity 2 mA, 35 cm2 electrodes, duration 20 min Stimulation location: anode ‐ M1 contralateral to painful side, cathode right supraorbital Number of treatments: x 3 per week for 3 weeks Control type: sham tDCS
Outcomes	Primary: pain VAS anchors 0 = no pain, 10 = unbearable When taken: "immediacy", 1 week, 3 weeks (unclear if from end of intervention) Secondary: None relevant
Notes	COI: study authors declared no COI Sources of support: none declared
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Comment: method of randomisation not reported
Allocation concealment (selection bias)	Unclear risk	Comment: no mention of allocation concealment procedures
Adequate blinding of participants?	Unclear risk	Comment: blinding not reported. Evidence that blinding can be inadequate at intensity of 2 mA
Adequate blinding of assessors?	Unclear risk	Comment: blinding not reported. Evidence that blinding can be inadequate at intensity of 2 mA
Incomplete outcome data (attrition bias) All outcomes	Unclear risk	Comment: unable to clearly verify if there was any attrition
Selective reporting (reporting bias)	Low risk	Comment: adequate reporting of outcomes
Study Size	High risk	Comment: total n = 14
Study duration	Unclear risk	Comment: 3‐week follow‐up
Other bias	Low risk	Comment: no other bias detected