APA (7th ed.) Citation

WJ, K., J, Y., DK, K., MG, L., AL, F., P, S., . . . EK, S. (2017). Severe COPD cases from Korea, Poland, and USA have substantial differences in respiratory symptoms and other respiratory illnesses. Dove Medical Press.

Chicago Style (17th ed.) Citation

WJ, Kim, et al. Severe COPD Cases from Korea, Poland, and USA Have Substantial Differences in Respiratory Symptoms and Other Respiratory Illnesses. Dove Medical Press, 2017.

MLA (9th ed.) Citation

WJ, Kim, et al. Severe COPD Cases from Korea, Poland, and USA Have Substantial Differences in Respiratory Symptoms and Other Respiratory Illnesses. Dove Medical Press, 2017.

Warning: These citations may not always be 100% accurate.