title: Less invasive cardiac output monitoring by earpiece densitometry.
mesh_terms: D002302:Cardiac Output; D004396:Coloring Agents; D003720:Densitometry / Q000379:methods*; D004431:Ear, External / Q000098:blood supply*; D006801:Humans; D008991:Monitoring, Physiologic / Q000379:methods*
chemical_list: D004396:Coloring Agents