title: Placebo-controlled oral challenge with cobalt in patients with positive patch tests to cobalt.
mesh_terms: D000284:Administration, Oral; D000328:Adult; D000368:Aged; D003035:Cobalt / Q000008:administration & dosage* / Q000009:adverse effects; D003877:Dermatitis, Contact / Q000175:diagnosis* / Q000209:etiology; D004032:Diet; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010328:Patch Tests / Q000379:methods*; D012189:Retrospective Studies
chemical_list: D003035:Cobalt