Fig. 1: Flowchart diagram of the Delphi process to develop the checklist.

The Delphi process started with members of the SC defining the research problem. Then, the field of concurrent tES-fMRI studies was systematically explored to find eligible people to invite to the SC and expert panel (EP). The checklist was then developed by the SC and sent for revisions to the EP. After this phase, the checklist was revised by the SC and sent for the rating phase. At the final stage, the ratings were analyzed. ‘n’ indicates the number of participants in each group.