Authors

Sciensano, Brussels, Belgium

University of Leuven, Leuven, Belgium

University of Leuven, Leuven, Belgium

European Citizen Science Association, Berlin, Germany

www.plazi.org, Bern, Switzerland

Universitat Oberta de Catalunya, Barcelona, Spain

University of Vienna, Vienna, Austria

U.S. Geological Survey, Nebraska Cooperative Fish and Wildlife Unit, School of Natural Resources, University of Nebraska -Lincoln, Lincoln, United States of America