Received: 25 January 2019
Accepted: 18 April 2019
First Online: 10 May 2019
Ethics approval and consent to participate
: This study was approved by the Internal Review Board at Yale University and patients gave written informed consent for study participation.
: Not applicable.
: Lingzhong Meng is a consultant to CAS Medical Systems, Inc. The other authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.