title: Effect of the probe frequency on sensitivity of color Doppler ultrasound to color blood flow: comment on the article by Torp-Pedersen et al.
authors.affiliation: Peking University People's Hospital, Beijing, China.
authors.forename: Jiann
authors.initials: J
authors.lastname: Zhu
mesh_terms: D001172:Arthritis, Rheumatoid / Q000175:diagnosis* / Q000000981:diagnostic imaging*; D006801:Humans; D012720:Severity of Illness Index; D018615:Ultrasonography, Doppler, Color / Q000379:methods*