Raisinghani, A., Wei, K., Crouse, L., Villanueva, F., Felgenbaum, H., Schiller, N., Aggarwal, P., Weiss, J., Naqvi, T., Siegel, R., Goldman, J., Monaghan, M., & DeMaria, A. (2002). Myocardial contrast echocardiography with triggered ultrasound does not cause ventricular premature beats: Evidence from PB127 studies. Journal of the american college of cardiology : JACC, 39(5), 363A-363A. https://doi.org/10.1016/S0735-1097(02)81629-1 (Original work published 2002)