Text and Data Mining valid from 2018-06-11
Received: 19 April 2018
Accepted: 30 April 2018
First Online: 11 June 2018
Ethics approval and consent to participate
: This study was approved by the University of Pittsburgh Institutional Review Board (ref. no.: PRO16100336). All participants consented to participate in the study.
: The authors declare that they have no competing interests.