Husain A, Shakoor S, Sajjad IA. FEV1/FEV6 as an Alternative to FEV1/FVC in the Spirometric Detection of Airway Obstruction in Chronic Smokers. apmc [Internet]. 2016Aug.28 [cited 2024Jul.3];10(3):147-51. Available from: https://apmcfmu.com/index.php/apmc/article/view/281