Intubation; Difficult

• Children's of Alabama at Birmingham — Birmingham, Alabama, United States
• Phoenix Children's Hospital — Phoenix, Arizona, United States
• Arkansas Children's Hospital — Little Rock, Arkansas, United States
• Children's Hospital of Central California — Madera, California, United States

• Ankara Atatürk Sanatoryum Training and Research Hospital — Ankara, Keçiören, Turkey (Türkiye)

• University of Louisville Medical School, Department of Anesthesiology and Perioperative Medicine — Louisville, Kentucky, United States

• University Hospital of Caen — Caen, France

• Memorial Hermann Hospital — Houston, Texas, United States

• The University of Texas Health Science Center at Houston — Houston, Texas, United States

Not specified

• Centre Hospitalier de l'Université de Montréal (CHUM) — Montreal, Quebec, Canada

• Miami Children's Hospital — Miami, Florida, United States

• Lehigh Valley Hospital — Allentown, Pennsylvania, United States