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References
1.
The description of the Possum equipment is based on the explanatory leaflet issued by Possum Research, 63 Mandeville Road, Aylesbury, Bucks.
2.
I should like to thank all patients who kindly and promptly co-operated, especially Mr. John Durr, who helped to start the questionnaire. I should also like to thank Dr. J. R. Silver for all his encouragement, and my staff, the Possum staff, and the hospital authorities who helped to make this report possible.