Kim 2016.

Study characteristics
Methods	Study design: randomised controlled trial Study grouping: parallel group
Participants	Baseline Characteristics Repetitive transcranial magnetic stimulation (rTMS) Age (mean ± SD): 28 ± 3 Sex (N (% female)): 12 (50%) Sample size: 12 Years of experience (mean ± SD): NR Control (placebo) Age (mean ± SD): 32 ± 7 Sex (N (% female)): 12 (50%) Sample size: 12 Years of experience (mean ± SD): NR Overall Age (mean ± SD): NR Sex (N (% female)): 28 (100%) Sample size: 24 Years of experience (mean ± SD): NR Included criteria: NR Excluded criteria: individuals with 1) past or current diagnosis of any axis I psychiatric disorder based on the Structured Clinical Interview for DSM‐IV‐TR Axis I Disorders, Patient Edition (SCID‐I/P),19 2) severe medical illness, 3) organic mental disorder, seizure disorder, or mental retardation, 4) pregnancy, 5) current psychotropic medication use, 6) surgical treatment of intracranial lesions, or 7) a magnetic substance in their brain or orbital area. Pretreatment: at baseline, there were no significant differences between the intervention group and the control group with regard to age, duration of employment, working hours per week, marital status, occupation, socio‐economic status, all Compliance rate: among the 28 enroled participants, data from four participants were dropped because they did not complete the TMS sessions or QEEG assessment: one participant from the active‐TMS group and one participant from the sham‐TMS group discontinued the TMS sessions due to headache and one participant from the active‐TMS group and one participant from the sham‐TMS group missed their QEEG appointments without giving notification. Ultimately, 24 participants completed all TMS sessions and QEEG assessments Response rate: NR Type of healthcare worker: various HCWs
Interventions	Intervention characteristics Repetitive transcranial magnetic stimulation (rTMS) Type of the intervention: Intervention type 2 ‐ to focus one’s attention away from the experience of stress Description of the intervention : Repetitive transcranial magnetic stimulation (rTMS) is a therapeutic technique for applying stimulation to the cerebral cortex in a non‐invasive manner The number of sessions: 12 Duration of each session on average: NR Duration of the entire intervention: 4 weeks Duration of the entire intervention short vs long: short Intervention deliverer: NR Intervention form: individual Control (sham TMS) Type of the intervention: NA Description of the intervention: NA The number of sessions: NA Duration of each session on average: NA Duration of the entire intervention: NA Duration of the entire intervention short vs long: NA Intervention deliverer: NA Intervention form: NA
Outcomes	Psychological strain Outcome type: ContinuousOutcome Beck’s depression inventory Outcome type: ContinuousOutcome Beck’s anxiety inventory Outcome type: ContinuousOutcome
Identification	Sponsorship source: NR Country: South‐Korea Setting: Hospital Comments: NR Authors name: Young In Kim Institution: Department of Psychiatry, Chung‐Ang University Hospital, Seoul, Republic of Korea Email: sunmikim706@gmail.com Address: Sun Mi Kim, MD, PhD Department of Psychiatry, Chung‐Ang University Hospital, 102 Heukseok‐ro, Dongjak‐gu, Seoul 06973, Republic of Korea Tel: +82‐2‐6299‐1519, Fax: +82‐2‐6298‐1508 Time period: NR
Notes	PSY included in analysis 2.1 Beck’s depression inventory included in analysis 2.3
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Quote: "Participants were randomly divided into two groups: the active‐TMS group and the sham‐TMS group. " Sequence generation process insufficiently described
Allocation concealment (selection bias)	Unclear risk	Difficult to judge whether participants and/or investigators could possibly foresee assignment
Blinding of participants and personnel (performance bias) All outcomes	Low risk	Participants were randomly divided into two groups: the active‐TMS group and the sham‐TMS group.
Blinding of outcome assessment (detection bias) All outcomes	Low risk	Participants were blinded and outcomes are self‐reported.
Incomplete outcome data (attrition bias) All outcomes	Low risk	No intention to treat analysis. Among the 28 enroled participants, data from four participants were dropped because they did not complete the TMS sessions or QEEG assessment (14%): one participant from the active‐TMS group and one participant from the sham‐TMS group discontinued the TMS sessions due to headache and one participant from the active‐TMS group and one participant from the sham‐TMS group missed their QEEG appointments without giving notification. Ultimately, 24 participants completed all TMS sessions and QEEG assessments. Missing not at random however below our pre‐defined cut‐off value.
Selective reporting (reporting bias)	Unclear risk	No trial registration or no study protocol reported, nor did we find one online. No indication of selective reporting.
Other bias	Unclear risk	Not able to assess response rate.