@article{myers_gujja_neelagaru_hsu_burkhoff_2011,  title={Noninvasive measurement of cardiac performance in recovery from exercise in heart failure patients},  volume={66},  ISSN={1807-5932},  url={https://doi.org/10.1590/S1807-59322011000400021},  DOI={10.1590/S1807-59322011000400021},  number={4},  journal={Clinics},  publisher={Faculdade de Medicina / USP},  author={Myers, Jonathan N and Gujja, Pradeep and Neelagaru, Suresh and Hsu, Leon and Burkhoff, Daniel},  year={2011},  pages={649–656} }