University of Belgrade
Serbia
Gangnam Severance Hospital, Yonsei University
Korea, Republic of
ABC Medical School
Brazil
Himeji Red Cross Hospital
Japan
Kumamoto University Hospital
Japan
University of California
United States
Kurume University School of Medicine
Japan
Kamagaya General Hospital
Japan
Gunma ENT Clinic & Lab
Japan
Saku Central Hospital Advanced Care Center
Japan
Osaka University Graduate School of Medicine
Japan
St. Mary’s Hospital
Italy
University of Catania
Italy
ASP Caltanissetta
Italy
National Taiwan University
Taiwan
Imam Abdulrahman Bin Faisal University
Saudi Arabia
Samsung Medical Center
Korea, Republic of