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Simplified COPD screening: validation of the PiKo-6® in primary care.
Frith P, Crockett A, Beilby J, Marshall D, Attewell R, Ratnanesan A, Gavagna G. Frith P, et al. Among authors: gavagna g. Prim Care Respir J. 2011 Jun;20(2):190-8, 2 p following 198. doi: 10.4104/pcrj.2011.00040. Prim Care Respir J. 2011. PMID: 21597667 Free PMC article.