Text and Data Mining valid from 2018-07-18
Received: 19 February 2018
Accepted: 27 April 2018
First Online: 18 July 2018
Ethics approval and consent to participate
: This study was approved by the local institutional review boards (protocol numbers 16/243/C, MEC-2016-281 and 290REG2016, respectively). A waiver for the requirement for informed consent was applied because the study only involves recorded medical data.
: Not applicable.
: All authors declare that they have no competing interests.
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