Acknowledgements

We gratefully acknowledge the contributions of the paper authors, the discussant and the other workshop participants for sharing their knowledge and contributing to a stimulating debate. The workshop participants were Roger Behrens, South Africa; Peter Bonsall, United Kingdom; Beat Brunner, Switzerland; Marco Diana, Italy; Blake Emery, United States; Pavlina Filemonova Rocakova, Czech Republic; Christine Fox, United States; Regine Gerike, Germany; Thomas Haupt, Germany; Reinhard Hoessinger, Austria; Peter Jones, United Kingdom; Stephen Jones, United States; Ian Ker, Australia; Martin Lee-Gosselin, Canada; Matthias Lenz, France; Michael Meschik, Austria; Linda Nijland, The Netherlands; Barbara Noble, United Kingdom; Francis Papon, France; David Perroud, Switzerland; Valentina Rappazzo, Italy; Anaïs Rocci, INRETS, France; Karel Schmeidler, Czech Republic; Giorgia Servente, Italy; Karl Sieber, United States [Discussant]; Anu Siren, Denmark; Juliane Stark, Austria; Justyna Szczepanska, Poland; Gordon Taylor, Canada; Maisa Tobias, Brazil; Klaas Van Zyl, South Africa; Ramakrishna Yennamani, United States; and Johanna Zmud, United States.