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Reliability and validity of the chronic respiratory questionnaire (CRQ).
  1. P J Wijkstra,
  2. E M TenVergert,
  3. R Van Altena,
  4. V Otten,
  5. D S Postma,
  6. J Kraan,
  7. G H Koëter
  1. Asthma Centre, Beatrixoord Hospital, Groningen, The Netherlands.

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