Correction: A Recombinant Vaccine Effectively Induces C5a-Specific Neutralizing Antibodies and Prevents Arthritis. - Kutty Selva Nandakumar; Åsa Jansson; Bingze Xu; Niclas Rydell; Parvien Ahooghalandari; Lars Hellman; Anna M. Blom; Rikard Holmdahl (PLoS ONE, 2011)