Chronic Obstructive Pulmonary Disease as Measured by FEV1, FVC and FEV1/FVC Ratio among Saw Mill Workers in Jos, Northern Nigeria. The Nig Health J [Internet]. 2015 Dec. 29 [cited 2025 May 9];15(1):1. Available from: https://www.tnhjph.com/index.php/tnhj/article/view/182