Screening for Chronic Obstructive Pulmonary Disease Using Spirometry: Summary of the Evidence for the U.S. Preventive Services Task Force

Appendix Figure 2.
Appendix Figure 2. Study flow diagram: key question 4.

This Article

  1. Published online before print March 3, 2008, Ann Intern Med April 1, 2008 vol. 148 no. 7 535-543
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