title: Chronic pain seen as vexing to diagnose.
authors.forename: H
authors.initials: H
authors.lastname: Gelb
authors.forename: M
authors.initials: M
authors.lastname: Gelb
mesh_terms: D005157:Facial Pain / Q000175:diagnosis*; D006801:Humans; D010148:Intractable Pain / Q000175:diagnosis*; D013705:Temporomandibular Joint Disorders / Q000175:diagnosis