Piya-amornphan, Nitita, Anoma Santiworakul, and Jiraphat Nawarat. 2018. “Chronic Obstructive Pulmonary Disease and Extrapulmonary Effects: Cognitive Impairment: Cognitive Impairment”. Journal of Health Science and Medical Research 36 (4):323-33. https://doi.org/10.31584/jhsmr.201829.