Comment on

• Quality of life in patients with chronic respiratory disease: the Spanish version of the Chronic Respiratory Questionnaire (CRQ).

  Güell R, Casan P, Sangenís M, Morante F, Belda J, Guyatt GH. Güell R, et al. Eur Respir J. 1998 Jan;11(1):55-60. doi: 10.1183/09031936.98.11010055. Eur Respir J. 1998. PMID: 9543270 Clinical Trial.
• Reliability and validity of a Swedish version of the St George's Respiratory Questionnaire.

  Engström CP, Persson LO, Larsson S, Sullivan M. Engström CP, et al. Eur Respir J. 1998 Jan;11(1):61-6. doi: 10.1183/09031936.98.11010061. Eur Respir J. 1998. PMID: 9543271