Acknowledgements
We would like to thank the following people for allowing us to use their illustrations: Bert Brouwenstijn (VU University Amsterdam), Henk Hiddink (ACVU-HBS), Harry Fokkens (Leiden University), Maaike Sier (BOOR), Laura Kooistra (BIAX), Otto Brinkkemper (RCE), „Mariëtte de Rooij & Eddy Smits (BAAC), Hans de Kievith (municipality of Breda), Miranda de Wit (ARC).
Martijn van Haasteren
martijnvanhaasteren@hotmail.com
Maaike Groot
VU University Amsterdam
Reviewdata:
Submission: 15/2/2012
Revision: 24/8/2012
2nd submission: 22/12/2012