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  1. Choking: First aid - Mayo Clinic

  2. Adult & Child Choking: Symptoms and First Aid | Red Cross

  3. Choking: First Aid and Prevention | Johns Hopkins Medicine

  4. Heimlich Maneuver: Steps, Instructions, When to Use - Verywell …

  5. Choking - Choking - Merck Manual Consumer Version

  6. What to Do When Someone is Choking: First Aid Steps

  7. Heimlich Maneuver: Choking Treatment Rescue Procedure and First Aid

  8. Choking First Aid Guide | St John Ambulance NSW

  9. Adult Choking - Symptoms & First Aid Advice - St John Ambulance