Erratum to: Qual Life Res DOI 10.1007/s11136-012-0302-8

Please note the below specified errors concerning reference numbers cited in the text of the original article.

Results section, 2nd paragraph, 4th sentence:

‘… back pain [46], chronic pain [47], and fibromyalgia [48] …’

should read

‘… back pain [46,47], chronic pain [48], and fibromyalgia [29] …’

Appendix, Table 2, 1st column, 10th entry:

‘Lorig et al. [19] (Spanish ASMP)’ should read ‘Lorig et al. [42] (Spanish ASMP)’

Appendix, Table 2, 1st column, 11th entry:

‘Lorig et al. [16] (CDSMP)’ should read ‘Lorig et al. [19] (CDSMP)’