Piya-amornphan, N., Santiworakul, A., & Nawarat, J. (2018). Chronic Obstructive Pulmonary Disease and Extrapulmonary Effects: Cognitive Impairment: Cognitive Impairment. Journal of Health Science and Medical Research, 36(4), 323–333. https://doi.org/10.31584/jhsmr.201829