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Scandinavian Journal of Rheumatology Volume 40, 2011 - Issue 1
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Letter

Adaptation of the Psoriatic Arthritis Quality of Life (PsAQol) instrument for Sweden: comments on the article by Billing et al

OR Madsen Department of Internal Medicine C/Rheumatology, Copenhagen University Hospital Gentofte, Hellerup, DenmarkCorrespondence[email protected]
Page 80 | Published online: 19 Jan 2011

References

  • Billing E, McKenna SP, Staun M, Lindquist U. Adaptation of the Psoriatic Arthritis Quality of Life (PsAQol) instrument for Sweden. Scand J Rheumatol 2010;39:223–8.
  • Altman DG. Practical statistics for medical research. London: Chapman & Hall, 1991.
  • Bland JM, Altman DG. Statistics notes: measurement error and correlation coefficients. BMJ 1996;313:41–2.
  • Bland JM, Altman DG. Statistics notes: measurement error. BMJ 1996;313:714.
  • Magid E, Petersen PH, Christensen M. A note on the theory of reference changes. Scand J Clin Lab Invest 1992;Suppl 208:95–101.

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