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APA Citation
Chung, B., Oon, Y., Thien, L., Pang, I., Chen, L., Ling, H., Chow, H., Chandan, D., Tan, C., Koh, K., Cham, Y., Said, A., Fong, A., & Ong, T. (n.d.). comparison of teicholz versus biplane simpson method in the assessment of left ventricular volumes and ejection fraction among healthy subjects. International journal of cardiology, 345, 42–. http://access.bl.uk/ark:/81055/vdc_100148175003.0x000044