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Ulcerative colitis and Crohn's disease in an unselected population of monozygotic and dizygotic twins. A study of heritability and the influence of smoking.
  1. C Tysk,
  2. E Lindberg,
  3. G Järnerot,
  4. B Flodérus-Myrhed
  1. Department of Medicine, Orebro Medical Center Hospital, Sweden.

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