Effect of psychological stress on time and frequency domain parameters of heart rate variability in undergraduate medical students. Journal of Fatima Jinnah Medical University, [S. l.], v. 13, n. 1, p. 34–37, 2019. Disponível em: https://mail.jfjmu.com/index.php/ojs/article/view/622. Acesso em: 16 may. 2026.