Text and Data Mining valid from 2019-10-01
Received: 9 August 2019
Revised: 9 August 2019
Accepted: 23 August 2019
First Online: 25 October 2019
Compliance with ethical standards
: The author declares that he has no conflict of interest.
: All applicable international, national, and/or institutional guidelines for the care and use of animals were followed.
: All necessary permits for sampling and observational field studies have been obtained by the author from the competent authorities and are mentioned in the acknowledgements, if applicable.
: There is no data associated with this manuscript.