When we published the article

“Leiknes KA et al., Current somatoform disorders in Norway: prevalence, risk factors and comorbidity with anxiety, depression and muscoskeletal disorders. Soc Psychiatry Psychiatr Epidemiol (2007) published online first 27 June 2007 (The original publication can be found via http://dx.doi.org/10.1007/s00127-007-0218-8)”

a writing mistake had been overlooked. In the third paragraph of the methods section, the sentence

For MSD, diagnostic requirements were three or more clinically significant lifetime MUSs with at least one MUS in the grouped recency category (i), (ii) or (iii) registered as present during the previous month, combined with the presence of at least one lifetime MUS with onset more than 1 year previously (see Appendix B for criteria).

should be replaced by

For MSD, diagnostic requirements were three or more clinically significant current MUSs with at least one MUS in the grouped recency category (i), (ii) or (iii) registered as present during the previous month, combined with the presence of at least one lifetime MUS with onset more than 1 year previously (see Appendix B for criteria).

The publisher apologizes for this mistake.