Title page
The association between serum levels of growth differentiation factor-15 and rheumatoid arthritis activity
Running title: GDF-15 in rheumatoid arthritis
Esalatmanesh K1, Fayyazi H1, Esalatmanesh R1, Khabbazi 2*
1Autoimmune Diseases Research Center, Kashan University of Medical Sciences, Kashan, Iran
2Connective Tissue Diseases Research Center, Tabriz University of Medical Sciences, Tabriz, Iran