APA (7th ed.) Citation

E, H., CN, G., & BP, G. (2005). Mitral valve prolapse. Lancet, 365(9458), 507. https://doi.org/10.1016/s0140-6736(05)17869-6

Chicago Style (17th ed.) Citation

E, Hayek, Gring CN, and Griffin BP. "Mitral Valve Prolapse." Lancet 365, no. 9458 (2005): 507. https://doi.org/10.1016/s0140-6736(05)17869-6.

MLA (9th ed.) Citation

E, Hayek, et al. "Mitral Valve Prolapse." Lancet, vol. 365, no. 9458, 2005, p. 507, https://doi.org/10.1016/s0140-6736(05)17869-6.