1. 1) Firestein G, Budd R, Gabriel SE, Mclnners IB, O’Dell J, eds: Kelley’s Textbook of Rheumatology, 9th Edition. Philadelphia: Saunders, 2012.
2. 2) Lawry GV, Kreder HJ, Hawker GA, Jerome D, eds: Edited quotes from Fam’s Musculoskeletal Examination and Joint Injection Techniques, 2nd Edition. Philadelphia: Mosby, 2010.
3. 3) Murayama G, Ogasawara M, Nemoto T, et al: Clinical miscount of involved joints denotes the need for ultrasound complementation in usual practice for patients with rheumatoid arthritis. Clin Exp Rheumatol, 2013; 31: 506-514.
4. 4) Ogasawara M, Murayama G, Yamada Y, et al: Autofeedback from ultrasound images provides rapid improvement in palpation skills for identifying joint swelling in rheumatoid arthritis. J Rheumatol, 2012; 39: 1207-1214.
5. 5) Wakefield RJ, Balint PV, Szkudlarek M, et al: Musculoskeletal ultrasound including definitions for ultrasonographic pathology. J Rheumatol, 2005; 32: 2485-2487.