Kamkar, M. Z., S. Rezvani Khorshidi, S. M. Alinaghi Maddah, A. Emami Zeydi, and M. Modanloo. “A Cross-Sectional Study Examining the Correlation Between Nocturnal Melatonin Level and Sleep Quality in Patients Admitted To the Cardiac Care Unit”. Open Access Macedonian Journal of Medical Sciences, vol. 6, no. 12, Dec. 2018, pp. 2342-7, doi:10.3889/oamjms.2018.451.