Contact dermatitis and cervical headgear.
D003877:Dermatitis, Contact / Q000209:etiology*; D005115:Extraoral Traction Appliances / Q000009:adverse effects*; D006801:Humans; D009532:Nickel / Q000009:adverse effects*; D009968:Orthodontic Appliances, Removable / Q000009:adverse effects*
D009532:Nickel