Interpretation of quality of life scores from the St George's Respiratory Questionnaire

¹Health Services Research Unit, Institut Municipal d'Investigació Mèdica, Barcelona, ²Pneumology Dept, La Paz Hospital, Madrid, ³Respiratory Unit, Cruces Hospital, Baracaldo (Biscay), ⁴Clinical Epidemiology Unit, La Princesa Hospital, Madrid, ⁵Pneumology Unit, San Pedro de Alcántara Hospital, Cáceres, ⁶Pneumology Unit, General Yagüe Hospital, Burgos, ⁷Pneumology Dept, La Princesa Hospital, Madrid and ⁸Pneumology Dept, Vall d'Hebron Hospital, Barcelona, Spain

M. Ferrer, Health Service Research Unit, Institut Municipal d'Investigació Mèdica, Carrer del Doctor Aiguader 80, E-08003, Barcelona, Spain. Fax: 34 932213237. E‐mail: mferrer@imim.es

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