Which of the following are true about oropharyngeal airways? 1. Incorrect placement can worsen airway obstruction. 2. They all consist of a flange, body, and channel(s). 3. They should only be used by trained personnel. 4. They are contraindicated in children and infants.   Group of answer choices 1, 3, and 4 only 1, 2, and 3 only 2 and 4 only 1 and 3 only

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