title: Letter: measurement of anti-TNF-α levels and antibodies against the drug.
authors.forename: M
authors.initials: M
authors.lastname: Chaparro
authors.forename: J P
authors.initials: JP
authors.lastname: Gisbert
mesh_terms: D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000097:blood*; D000906:Antibodies / Q000097:blood*; D000911:Antibodies, Monoclonal / Q000097:blood* / Q000276:immunology*; D006801:Humans; D007118:Immunoassay / Q000379:methods*
chemical_list: D000894:Anti-Inflammatory Agents, Non-Steroidal; D000906:Antibodies; D000911:Antibodies, Monoclonal