title: Efficiency studies: aspiration, chest injury and prone CPR.
mesh_terms: D000328:Adult; D000368:Aged; D002102:Cadaver; D006801:Humans; D008875:Middle Aged; D011015:Pneumonia, Aspiration / Q000517:prevention & control*; D012151:Resuscitation; D013898:Thoracic Injuries / Q000517:prevention & control*