Progression

• Nagoya University Hospital — Nagoya, Aichi-ken, Japan
• Fujita Health University Hospital — Toyoake, Aichi-ken, Japan
• Hirosaki University School of Medicine — Hirosaki, Aomori, Japan
• Chiba University Hospital — Chiba, Japan

• Necibe — Kütahya, Turkey (Türkiye)

• Department of ENT, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology — Wuhan, Hubei, China

• Royal Devon & Exeter NHS Foundation Trust — Exeter, Devon, United Kingdom

• Yale School of Medicine — New Haven, Connecticut, United States
• Kansas University Medical Center — Kansas City, Kansas, United States
• Washington University in St Louis — St Louis, Missouri, United States
• Carolina Neurosurgery & Spine Associates — Charlotte, North Carolina, United States

• Wroclaw Medical University — Wroclaw, Poland

• Pak Emirates Military Hospital — Rawalpindi, Punjab Province, Pakistan

• Hunan Provincal Tumor Hospital — Changsha, Hunan, China

Not specified