Noninvasive cardiovascular monitoring based on electrocardiography and ballistocardiography: a feasibility study on patients in the surgical intensive care unit. - Mohamed Zaid; Salman Ahmad; Ahmad Suliman; Maraya Camazine; Isaac Weber; Jared Sheppard; Mihail Popescu; James Keller 001; Laurel Despins; Marjorie Skubic; Giovanna Guidoboni (EMBC, 2021)