A. A. Che Ani, T. K. . Dharmalingam, N. A. Che Senapi, P. S. Z. . Basir, and M. E. . Abd Halin, “Perioperative anxiety and depression among adults undergoing elective surgery: a cross-sectional survey”, MYJA, vol. 2, no. 1, pp. 25–40, Jun. 2023.