Text and Data Mining valid from 2019-01-31
Received: 21 October 2018
Revised: 8 January 2019
Accepted: 14 January 2019
First Online: 31 January 2019
Compliance with ethical standards
: The authors received no specific funding for this work and they declare that they have no conflict of interest.
: We neither used endangered species nor were the investigated animals collected in protected areas. All applicable international, national, and/or institutional guidelines for the care and use of animals were followed.