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APA Citation
Chang, C., Chuang, L., Lin, S., Lee, C., Tsai, Y., Wei, Y., Cheng, S., Hsu, J., Kuo, P., Yu, C., & Chen, N. (2016). factors responsible for poor sleep quality in patients with chronic obstructive pulmonary disease. BMC pulmonary medicine, 16(1), 1–8. http://access.bl.uk/ark:/81055/vdc_100080567082.0x0000ff