Erratum

In the article cited above, the online version had the necessary grant sponsor and number information omitted. The opening page footnote should read:

Grant sponsor: the EU; Grant number: LSHC-LT-2004-503465; Grant sponsor: EU Apo-Sys; Grant number: EU Food-CT-2005-016320; Grant sponsors: Deutsche Krebshilfe, the BMBF for NGNF+, the Swedish Cancer Society, the Swedish Council for Working Life and Social Research; Grant number: Health-F4-2007-200767.

The publisher apologizes for any confusion caused by this error.