R. Akdag, N. Ceviz, C. Karakelleoglu, N. Unuvar, and E. Bakan, “Changes in serum cortisol concentrations in response to music in preterm infants ”, Ann Med Res , vol. 1, no. 4, pp. 0272–0274, May 2021, Accessed: Sep. 16, 2026. [Online]. Available: http://www.annalsmedres.org/index.php/aomr/article/view/2366