Text and Data Mining valid from 2019-03-27
Received: 29 October 2018
Accepted: 16 March 2019
First Online: 27 March 2019
Compliance with ethical standards
: The author(s) declare that they have no conflict of interest.
: All procedures performed were in accordance and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards and ethical approval was obtained from the Beth Israel Deaconess Medical Center Institutional Review Board.
: Informed consent for this retrospective study was waived by the Beth Israel Deaconess Medical Center Institutional review board given no more than minimal risk to the privacy of individuals given protection of health information identifiers.