Received: 18 December 2020
Accepted: 19 February 2021
First Online: 1 March 2021
Ethics approval and consent for publication
: This study was approved by the Johns Hopkins Institutional Review Board (IRB00255571) and did not require patient consent.
: Not applicable.
: GL is an unpaid consultant for EchoNous, an ultrasound device company. EchoNous machines were used for four of the examinations used in the study. EchoNous was not involved in the design, execution, analysis or writing of this work. The other authors have no competing interests.