Abstract
In approaching a survey such as this, one is immediately faced not only by the obvious difficulties in a study of a broad cross-section of the population with many divergencies and categories in the hands of so many different physicians and observers, but also, as Gibbs and Stamps (1958) point out, by the fact that “new information has developed so rapidly in the last few years that no time has been allowed for dead opinions to be given a decent burial”.

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