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In the recent BMJ there is a report that celiac disease is far more common
than generally thought:

Coeliac disease in primary care: case finding study
Harold Hin, Graham Bird, Peter Fisher, Nick Mahy, and Derek Jewell
BMJ 1999; 318: 164-167.

Here is the full text (with button to print out a PDF version):

  http://www.bmj.com/cgi/content/full/318/7177/164

Don.