APA

Song I., Althoff C. E., Haibel H., Hermann K. A., Poddubnyy D., Listing J., Weiß A., Djacenko S., Burmester G. R., Bohl-Bühler M., Freundlich B., Rudwaleit M. & Sieper J. (20120821). Frequency and duration of drug-free remission after 1 year of treatment with etanercept versus sulfasalazine in early axial spondyloarthritis: 2 year data of the ESTHER trial. : Annals of the rheumatic diseases.

Chicago

Song In-Ho, Althoff Christian E, Haibel Hildrun, Hermann Kay-Geert A, Poddubnyy Denis, Listing Joachim, Weiß Anja, Djacenko Svetlana, Burmester Gerd R, Bohl-Bühler Martin, Freundlich Bruce, Rudwaleit Martin and Sieper Joachim. 20120821. Frequency and duration of drug-free remission after 1 year of treatment with etanercept versus sulfasalazine in early axial spondyloarthritis: 2 year data of the ESTHER trial. : Annals of the rheumatic diseases.

Harvard

Song I., Althoff C. E., Haibel H., Hermann K. A., Poddubnyy D., Listing J., Weiß A., Djacenko S., Burmester G. R., Bohl-Bühler M., Freundlich B., Rudwaleit M. and Sieper J. (20120821). Frequency and duration of drug-free remission after 1 year of treatment with etanercept versus sulfasalazine in early axial spondyloarthritis: 2 year data of the ESTHER trial. : Annals of the rheumatic diseases.

MLA

Song In-Ho, Althoff Christian E, Haibel Hildrun, Hermann Kay-Geert A, Poddubnyy Denis, Listing Joachim, Weiß Anja, Djacenko Svetlana, Burmester Gerd R, Bohl-Bühler Martin, Freundlich Bruce, Rudwaleit Martin and Sieper Joachim. Frequency and duration of drug-free remission after 1 year of treatment with etanercept versus sulfasalazine in early axial spondyloarthritis: 2 year data of the ESTHER trial. : Annals of the rheumatic diseases. 20120821.