title: A new ULF--Bcg bed: two degrees of freedom, air bearings, hyperboloidic surface.
mesh_terms: D001450:Ballistocardiography / Q000295:instrumentation*; D001513:Beds; D006801:Humans; D007702:Kinetocardiography; D011137:Polystyrenes; D012149:Restraint, Physical; D013499:Surface Properties
chemical_list: D011137:Polystyrenes