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British Thoracic Society & Scottish Intercollegiate Guidelines Network (SIGN). British Guideline on the Management of Asthma . Guideline No 63. Edinburgh: SIGN; 2004. (HTMLArxivat 2006-06-18 a Wayback Machine., Full PDFArxivat 2006-07-24 a Wayback Machine., [http ://www.sign.ac.uk/pdf/qrg63.pdf Arxivat 2006-07-24 a Wayback Machine. Summary PDF])