Text and Data Mining valid from 2018-05-01
Received: 22 March 2018
Accepted: 14 May 2018
First Online: 12 June 2018
Compliance with ethical standards
: MJ, RB, MS, and JV declare that they have no conflict of interest.
: The study was performed in a manner to conform with the Helsinki Declaration of 1975, as revised in 2000 and 2008 concerning human and animal rights, and the authors followed the policy concerning informed consent as shown on Springer.com. The study protocol was approved by the institutional review board and ethics committee.