<qa>  What is the effect of the ultrasound examination on the outcomes of the subjects?This study is observational, not interventional, because the experimental ultrasound will be performed in all subjects and will not be used in the clinical care of patients consequently, will not have the opportunity to affect clinical outcomes. Experimental images will be reviewed after completion of clinical care and will not be provided to the clinicians caring for the subjects. The investigators are not measuring the effect of the ultrasound examination on the subjects outcomes. 