Abstract

References
1.
Becker
W
. ed (1969 ) Atlas of Otorhinolaryngology and Bronchœsophagology.
Saunders , Philadelphia and London ; p 31 .
2.
Brooks
D N
. (1968 ) Journal of International Audiology
2 , 280 .
3.
Shah
N
. (1971 ) Journal of Laryngology
85 , 283 .
4.
Shah
N
. (1972 ) Communication, British Society of Audiology.
