ACKNOWLEDGMENTS
The authors would like to acknowledge the contribution of Drs. V. K. Sharma, P. Saunders, C. Sullivan, С McWilliam, L. M. Voruganti, and S. V. Manohar, who undertook the follow-up interviewing, and Dr. N. Wood, Miss M. Heary, Mrs. J. Silcock, Miss C. Hensey, Mrs. J. Wood, and Mrs. R. Searle, who undertook the interviewing of the initial sample. Our thanks are also due to Mr. M. Kayodi for his work on the computer and to Mrs. B. Ackerley for her skill in organizing the interviewing. This research was supported by grants from the Wellcome Trust and the Mersey Regional Health Authority, United Kingdom.
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