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| Cut-off value of FEV1/FEV6 to determine airflow limitation using handheld spirometry in subjects with risk of chronic obstructive pulmonary disease Yong Il Hwang, Youlim Kim, Chin Kook Rhee, Deog Kyeom Kim, Yong Bum Park, Kwang Ha Yoo, Ki-Suck Jung, Chang Youl Lee 
		Korean J Intern Med. 2021;36(3):629-635.   Published online 2020 Jun 24		    DOI: https://doi.org/10.3904/kjim.2019.314
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| Citations to this article as recorded by  How to Enhance the Diagnosis of Early Stages of Chronic Obstructive Pulmonary Disease (COPD)? The Role of Mobile Spirometry in COPD Screening and Diagnosis—A Systematic Review Piotr Jankowski, Katarzyna Mycroft, Katarzyna Górska, Piotr Korczyński, Rafał Krenke Advances in Respiratory Medicine.2024; 92(2): 158.     CrossRef Accuracy of portable spirometers in the diagnosis of chronic obstructive pulmonary disease A meta-analysis Jiawei Zhou, Xiaomeng Li, Xingjian Wang, Na Yu, Wei Wang npj Primary Care Respiratory Medicine.2022;[Epub]     CrossRef |