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Cystic fibrosis and the month of birth
  1. T J David,
  2. Gillian A Elstow,
  3. J H Baumer,
  4. C Mary Evans
  1. Department of Child Health, University of Manchester, Manchester
  2. The Department of Child Health, University of Bristol, Bristol


    A bimodal birth distribution and seasonal trend has been previously reported in cystic fibrosis. The present study of 412 cases in Manchester and Bristol does not confirm the presence of a seasonal trend or any cyclic variation, and in general the trends in the present study are the reverse of those in the previous reports.

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