Non-invasive vagus nerve stimulation reduces sympathetic preponderance in patients with tinnitus. Ylikoski J, Lehtimäki J, Pirvola U, Mäkitie A, Aarnisalo A, Hyvärinen P, Ylikoski M. Acta Otolaryngol. 2017 Apr;137(4):426-431. doi: 10.1080/00016489.2016.1269197. Epub 2017 Jan 13
Transcutaneous vagus nerve stimulation in tinnitus: a pilot study. Lehtimäki J, Hyvärinen P, Ylikoski M, Bergholm M, Mäkelä JP, Aarnisalo A, Pirvola U, Mäkitie A, Ylikoski J. Acta Otolaryngol. 2013 Apr;133(4):378-82. doi: 10.3109/00016489.2012.750736. Epub 2012 Dec 13
Feasibility, safety and efficacy of transcutaneous vagus nerve stimulation in chronic tinnitus: an open pilot study. Kreuzer PM, Landgrebe M, Resch M, Husser O, Schecklmann M, Geisreiter F, Poeppl TB, Prasser SJ, Hajak G, Rupprecht R, Langguth B. Brain Stimul. 2014 Sep-Oct;7(5):740-7. doi: 10.1016/j.brs.2014.05.003. Epub 2014 Jun 4.
Transcutaneous vagus nerve stimulation modulates tinnitus-related beta- and gamma-band activity. Hyvärinen P, Yrttiaho S, Lehtimäki J, Ilmoniemi RJ, Mäkitie A, Ylikoski J, Mäkelä JP, Aarnisalo AA. Ear Hear. 2015 May-Jun;36(3):e76-85. doi: 10.1097/AUD.0000000000000123
Feasibility and Safety of Transcutaneous Vagus Nerve Stimulation Paired with Notched Music Therapy for the Treatment of Chronic Tinnitus. Shim HJ, Kwak MY, An YH, Kim DH, Kim YJ, Kim HJ. J Audiol Otol. 2015 Dec;19(3):159-67. doi: 10.7874/jao.2015.19.3.159. Epub 2015 Dec 18.