title: Reply to letter to the editor by Toda.
authors.affiliation: Department of Orthopaedic Surgery, School of Medicine, Keio University, 35 Shinanomachi, Shinjuku, Tokyo, 160-8582, Japan, masa@a8.keio.jp.
authors.forename: Masaya
authors.initials: M
authors.lastname: Nakamura
authors.forename: Takahiro
authors.initials: T
authors.lastname: Ushida
authors.forename: Yoshiaki
authors.initials: Y
authors.lastname: Toyama
mesh_terms: D059350:Chronic Pain / Q000209:etiology* / Q000523:psychology*; D005260:Female; D006801:Humans; D008297:Male; D059352:Musculoskeletal Pain / Q000209:etiology*; D009437:Neuralgia / Q000209:etiology*