Health status in routine clinical practice: validity of the clinical COPD questionnaire at the individual patient level by de Vos Barbara, Snijders Sandra L, Kerstjens Huib AM, Kocks Janwillem WH, Biermann Jacqueline J, van Hengel Peter, Strijbos Jaap H, Bosveld Henk EP, van der Molen Thys

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