Text and Data Mining valid from 2019-10-01
Received: 12 April 2019
Revised: 21 July 2019
Accepted: 23 August 2019
First Online: 14 October 2019
Compliance with ethical standards
: The authors declare that they have 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 authors from the competent authorities and are mentioned in the acknowledgements, if applicable.
: All data generated or analysed during this study are included in this published article. The table with the raw data is provided as supplementary material.