Mansoor Zeeshan, et al. “Early Asymptomatic Decline in Left Ventricular Ejection Fraction in Adult Cancer Patients Receiving Trastuzumab”. Pakistan Armed Forces Medical Journal, vol. 73, no. 4, July 2023, pp. 1204-7, https://doi.org/10.51253/pafmj.v73iSUPPL-1.8608.