doi:10.1017/S0952523812000223, Published by Cambridge University Press 9 July 2012.
The publisher apologizes for the following error to the Supplementary Materials that accompany this article.
For the article by Bickelman et al., published online 9th July 2012, the wrong file was posted for Bickelmann supplementary table 3. The correct file for Bickelmann supplementary table 3 has been uploaded to replace it.