Correction: Error in Article on Airflow Obstruction

Excerpt

To the Editors: Our article had two typographic errors (1). The first was in the abstract under Design. The sentence should have read, "Case-control study, using nonobese, age- and height-matched nonsmokers." The second error was in the second line of the legend to Figure 1. It should have read "V50 = forced expiratory volume at 50% of vital capacity."