Liu, Quan-Xing
Herman, Peter M. J.
Mooij, Wolf M.
Huisman, Jef
Scheffer, Marten
Olff, Han
van de Koppel, Johan
Article History
Received: 23 March 2014
Accepted: 11 September 2014
First Online: 22 October 2014
Competing interests
: The authors declare no competing financial interests.