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Comment from Don Kasarda, Albany, California
 
Probably the first published description (I think there have been others
since) of constipation in celiac patients before diagnosis was published in
1972, where 12 out of 112 children were noted to have been constipated at
some time before diagnosis.  The exact reference follows:
 
Bridget Egan-Mitchell and Brian McNicholl. 1972. Constipation in childhood
celiac disease. Archives of Disease in Childhood 47:238-240.