Bardakjian, Tanya M.
Helbig, Ingo
Quinn, Colin
Elman, Lauren B.
McCluskey, Leo F.
Scherer, Steven S.
Gonzalez-Alegre, Pedro
Article History
Received: 19 December 2017
Accepted: 19 March 2018
First Online: 28 March 2018
Compliance with ethical standards
: This study was approved by the Institutional Review Committee at the University of Pennsylvania. As an IRB-approved retrospective analysis, approval to conduct this study by an ethical standards committee was received.