Smartphone-Based VO2max Measurement With Heart Snapshot in Clinical and Real-world Settings With a Diverse Population: Validation Study by Webster, Dan E, Tummalacherla, Meghasyam, Higgins, Michael, Wing, David, Ashley, Euan, Kelly, Valerie E, McConnell, Michael V, Muse, Evan D, Olgin, Jeffrey E, Mangravite, Lara M, Godino, Job, Kellen, Michael R, Omberg, Larsson

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