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Classification of HOA. | MSK = musculoskeletal. | Yap, F. Y., Skalski, M. R., Patel, D. B., Schein, A. J., White, E. A., Tomasian, A., … Matcuk, G. R. (2016). Hypertrophic Osteoarthropathy: Clinical and Imaging Features. RadioGraphics, 37(1), 157–195. https://doi.org/10.1148/rg.2017160052