Interleukin 15 Levels in Serum May Predict a Severe Disease Course in Patients with Early Arthritis

The work of Belen Diaz-Sanchez was supported by the RETICS Programme (Programa de Redes Tematicas de Investigacion Colaborativa [Colaborative Research Thematic Network Programme]; RD08/0075 - RIER [Red de Inflamacion y Enfermedades Reumaticas; Inflammation and Rheumatic Diseases Network]) from the Instituto de Salud Carlos III, Spain (URL: www.isciii.es) within the VI National Plan for I+D+I 2008–2011 (FEDER). The work of Isidoro Gonzalez-Alvaro was in part supported by a grant for the Intensification of the Research Tasks in the National Health Care System from Instituto de Salud Carlos III, Spain. The consumables for measurements and data analysis were supported by a Fondo de Investigacion Sanitaria grant (08/0754) from the Instituto de Salud Carlos III