Chunk #5 — Introduction

Source

Time to First Morning Cigarette and Risk of Chronic Obstructive Pulmonary Disease: Smokers in the PLCO Cancer Screening Trial.

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Therefore, we evaluated the association between TTFC and COPD in a cross-sectional sample from the Prostate, Lung, Colorectal, and Ovarian (PLCO) Cancer Screening Trial [17, 18].