Cholecystitis, Acute

• Södersjukhuset — Stockholm, Stockholm County, Sweden

• King Abulaziz University — Jeddah, Mecca Region, Saudi Arabia

• Kangbuk Samsung Hospital — Seoul, South Korea

• Karolinska University Hospital, Center for Digestive Diseases — Stockholm, Sweden

• UC Davis Medical Center — Sacramento, California, United States

Not specified

• Seoul St. Mary's hospital — Seoul, Seocho-gu, Banopo-dong, South Korea

• Ajou University Hospital — Suwon, Gyeonggido, South Korea

• University Hospital — San Antonio, Texas, United States

• Department of HBP Surgery, Seoul St. Mary's hospital — Seoul, Seocho-gu, Banopo-dong, South Korea