Butcher, C. J. T., Sohaib, S. M. A., Shun-Shin, M. J., Haynes, R., Khan, H., Kyriacou, A., Whinnett, Z., Shi, R., Cantor, E. J., Chen, Z., Haldar, S., Cleleand, J. G. F., Hussain, W., Markides, V., Jones, D. G., Lane, R. E., Francis, D. P., Mason, M. J., & Wong, T. (n.d.). 123Targeted left ventricular endocardial leads for cardiac resynchronisation therapy guided by detailed haemodynamic assessment and high resolution electroanatomical mapping. Europace, 20, iv53. http://access.bl.uk/ark:/81055/vdc_100095476676.0x000028