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Validation of the clinical COPD Questionnaire (CCQ) in primary care.
Ställberg B, Nokela M, Ehrs PO, Hjemdal P, Jonsson EW. Ställberg B, et al. Among authors: ehrs po. Health Qual Life Outcomes. 2009 Mar 25;7:26. doi: 10.1186/1477-7525-7-26. Health Qual Life Outcomes. 2009. PMID: 19320988 Free PMC article.
Quality of life in primary care asthma.
Ehrs PO, Aberg H, Larsson K. Ehrs PO, et al. Respir Med. 2001 Jan;95(1):22-30. doi: 10.1053/rmed.2000.0967. Respir Med. 2001. PMID: 11207013 Free article.