Received: 8 May 2019
Accepted: 13 August 2019
First Online: 17 September 2019
Ethics approval and consent to participate
: Ethical clearance for this study was obtained from the Internal Review Board (IRB) at the Washington University in St Louis, where the first author was a doctoral student. Verbal informed consent was obtained from participants. Their privacy and confidentiality were maintained throughout the study.
: Not applicable.
: The authors declare that they have no competing interests.