“…The morbidity rate of intubation is low but rendered significant because of its frequent use. Reviews of the more common complications have been published, as also have comparisons of morbidity rates with various techniques and materials (Baron & Kohlmoos 1951, Blanc & Tremblay 1974, Bryce et al 1968, Kambic & Radsel 1978, McGovern et al 1971. Histological analyses of the lesions produced by intubation have been made with accuracy both quantitatively and qualitatively (Burns et al 1970, Hilding 1971, Loeser et al 1978.…”