patients Of the 76 patients followed, 54 were contacted in 1965, 43 of these attended for examination, and 11 replied to the questionary. Of the 121 patients treated at some time by operation, 111 were con- tacted, 80 of these were examined, and 31 replied to the questionary. There were no more known deaths in the medically-treated group, but 4 of those treated by operation had died.
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C. E. Field (1969) studied this question.
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