Text and Data Mining valid from 2018-08-24
Received: 15 May 2018
Accepted: 21 August 2018
First Online: 24 August 2018
Compliance with ethical standards
: The authors declare that they have no conflicts of interest.
: This research involved humans. However, since this retrospective study was performed using a national database with deidentified patients, risk to participants is minimal.
: There is no consent required.