title: Reply from the authors.
authors: Chiba, Japan.
authors: J
authors: J
authors: Tokumine
authors: A T
authors: AT
authors: Lefor
authors: A
authors: A
authors: Yonei
mesh_terms: D002405:Catheterization, Central Venous / Q000379:methods*; D005260:Female; D006801:Humans; D008297:Male; D018084:Ultrasonography, Interventional / Q000295:instrumentation* / Q000379:methods*; D014680:Veins / Q000000981:diagnostic imaging*