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Questions on questionnaire development
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  1. J C van der Wouden
  1. Dept of General Practice, Erasmus MC, Rotterdam, Netherlands; vanderwouden@hag.fgg.eur.nl

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With interest I read the paper by Powell et al1 on the development of a questionnaire to describe respiratory symptoms in infants and preschool children. Because of the age of the children this is a difficult topic, and the authors are to be congratulated for their attempt. However, a number of questions arose when reading their paper. …

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