An Observational and Comparative Study of Diurnal Variation of Spirometry Test Parameters among First and Second Year Normal and Healthy Medical Undergraduate Students. International Journal of Physiology, [S. l.], v. 8, n. 2, p. 104–109, 2020. DOI: 10.37506/ijop.v8i2.1256. Disponível em: https://ijop.net/index.php/ijop/article/view/1256. Acesso em: 1 jun. 2026.