George Brown and I would like to congratulate David Curson and his colleagues on the conception and execution of this survey, but hope they are wrong in thinking that there can never be another such exercise. We are grateful to them and to the Editor for allowing us a brief preliminary comment. We have been sufficiently intrigued to want to go back to our data for new analyses, but this means reconstituting the original data base and will take some time.
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John Wing (1992) studied this question.
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