Accuracy of symptoms, signs, and C-reactive protein for early chronic obstructive pulmonary disease by Berna DL Broekhuizen, Alfred PE Sachs, Theo J Verheij, Kristel JM Janssen, Gerard Asma, Jan-Willem J Lammers, René Hage, Ernst Lammers, Arno W Hoes, and Karel G Moons BJGP Volume 62(602):e632-e638 September 1, 2012 ©2012 by British Journal of General Practice
Flowchart of included patients. Berna DL Broekhuizen et al. Br J Gen Pract 2012;62:e632-e638 ©2012 by British Journal of General Practice