Figure 2. The Network Structure of Changes of Severity of Tinnitus.

The lines between nodes represent direct comparisons in various trials, and the size of each circle is proportional to the size of the population involved in each specific treatment. The thickness of the lines is proportional to the number of trials connected to the network. a-tDCS indicates anodal transcranial direct current stimulation; cTBS, continuous theta-burst stimulation; c-tDCS, cathodal tDCS; dTMS, deep transcranial magnetic stimulation; F3, left dorsolateral prefrontal cortex (DLPFC); F4, right DLPFC; Fp2, right supraorbital area; HF, high-frequency; iTBS, intermittent TBS; LF, low-frequency; rTMS, repetitive TMS; T3, left auditory cortex; T4, right auditory cortex; and tRNS, transcranial random noise stimulation.