Hoarseness

• North Denmark Regional Hospital — Hjørring, Denmark
• Aalborg University Hospital — Thisted, Denmark

• Seoul National University Bundang Hospital — Seongnam-si, Gyeonggi-do, South Korea

• Chonnam National University Hwasun Hopspital — Hwasun, Jeollanamdo, South Korea
• Chonnam National University Hospital — Gwangju, South Korea

• Oregon Health & Science University — Portland, Oregon, United States

• Yeungnam University Hospital — Daegu, South Korea

• Massachusetts Eye and Ear Infirmary — Boston, Massachusetts, United States
• Drexell University College of Medicine — Philadelphia, Pennsylvania, United States
• Children's Hospital of Wisconsin — Milwaukee, Wisconsin, United States
• The Hospital For Sick Children — Toronto, Ontario, Canada

• BP Koirala Institute of Health Sciences (BPKIHS) — Dharān, Koshi, Nepal

• University Hospital Ostrava — Ostrava, Moravian-Silesian Region, Czechia

Not specified

• Department of Anesthesia and Intensive Care Medicine, University of Rostock — Rostock, Mecklenburg-Vorpommern, Germany