Bibliographical noteFunding Information:
This research was supported by the National Heart, Lung and Blood Institute (NHLBI) grant U10HL074424 (LEUKO and MACRO) for the COPD Clinical Research Network (CCRN). This material is also the result of work supported with resources of the Minneapolis V A Health Care System. W e thank Helen V oelker and Sarah Lindberg, MPH from the Division of Biostatistics, University of Minnesota, Minneapolis, MN, for providing the data and biostatistical support.
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