Monetary value of lost productivity over a five year follow up in early rheumatoid arthritis estimated on the basis of official register data on patients' sickness absence and gross income: experience from the FIN-RACo trial.
Puolakka K, Kautiainen H, Pekurinen M, Möttönen T, Hannonen P, Korpela M, Hakala M, Arkela-Kautiainen M, Luukkainen R, Leirisalo-Repo M, et al. Ann Rheum Dis. 2006 Jul; 65(7):899-904. Epub 2005 Nov 16.