Correction: Clinical response to discontinuation of anti-TNF therapy in patients with ankylosing spondylitis after 3 years of continuous treatment with infliximab

Dr Braun and Dr Sieper have held consultancies and received research honoraria, speaker's honoraria and grants/research support from Centocor, Schering-Plough, Essex Pharma, Wyeth and Abbott. Dr Zeidler has received speaker's honoraria from Essex Pharma. Dr Burmester has held consultancies for Centocor, Essex Pharma, Wyeth and Abbott; has received honoraria from Centocor, Essex Pharma, Wyeth and Abbott; has been a member of a speaker's bureau for Centocor, Essex Pharma, Wyeth and Abbott; and has received grants/research support from Centocor, Essex Pharma and Abbott. The other authors declare no conflicts of interest.XB: Preparation of data analysis, preparation of the manuscript and study coordination; JL, AZ: Data analysis and statistical evaluation; JB, MR: Monitoring and investigation of the patients and study coordination; RA, GB, EG-I, HK, MS, HS, HZ: clinical investigation; JS: Investigator, writing of the manuscript; JB: Idea, writing of the manuscript, prinicipal investigator and responsible for the study.