Text and Data Mining valid from 2018-04-04
Received: 24 March 2018
Accepted: 29 March 2018
First Online: 4 April 2018
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: The manuscript does not contain clinical studies or identifying patient data.
: This article does not contain any studies with human and animals, performed by any of the authors.
: Given the absence of identifying patient data, informed consent was deferred.
: This research received no specific grant from any funding agency, commercial, or not-for-profit sectors.