SLC12A2 and Tinnitus: Some co-transporter and/or ion channels, for example, K+– Cl− co-transporter (KCC2) [10, 11], voltage-gated sodium channels [12, 13], transient outward potassium currents, the glycine-induced chloride channels [14], L-type calcium channels [15], and Na-K-2Cl co-transporter 1 (NKCC1) [16], were reported to be associated with tinnitus.