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An article on laminated air flow (Techniques Reduce Contamination) in JAMAMedical News, Aug 15, 1966, page 33 should have stated that a complete air change occurs four times per minute (not once every four minutes) in the NIH test facility supervised by Donald Fox.
Correction. JAMA. 1966;198(3):50. doi:10.1001/jama.1966.03110160024014