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Ventilatory obstruction from kinked armoured tube:

P S Balakrishna ; Anil Shetty ; Gayathri Bhat.
http://www.ijaweb.org/article.asp?issn=0019-5049;year=2010;volume=54;issue=4;spage=355;epage=356;aulast=Balakrishna.  , 2010