Subjective Tinnitus

• Krankenhaus der Elisabethinen — Graz, Austria
• Bezirkskrankenhaus Kufstein — Kufstein, Austria
• A. ö. Krankenhaus der Elisabethinen Linz — Linz, Austria
• Salzburger Landeskrankenhaus, Universitätsklinik für Hals-Nasen-Ohren-Krankheiten — Salzburg, Austria

• Horizon Clinical Research Associates PLLC — Gilbert, Arizona, United States
• Phoenix Clinical — Phoenix, Arizona, United States
• Paradigm Clinical Research — Tucson, Arizona, United States
• Providence Clinical Research — Burbank, California, United States

Not specified

• AZ Sint Lucas, ENT department — Assebroek-Brugge, Belgium
• University Hospital Brussels, ENT department — Brussels, Belgium
• Clinique Universitaire Saint-Luc — Brussels, Belgium
• Dr. Henri HABERMAN — Brussels, Belgium

• Necmettin Erbakan University Meram Faculty of Medicine — Konya, Meram, Turkey (Türkiye)