In the article "Chest Physiotherapy in the Newborn: Effect on Secretions Removed" by Etches and Scott (Pediatrics 62:713, November 1978), there was an error on page 713 regarding the amount of negative pressure generated by the Air Shields Diapump. The sentence should read, "The suction source was the routine apparatus in our unit—an Air Shields Diapump generating a negative pressure of less than 150 mm Hg."
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Etches et al. (1978) studied this question.