Ishida, S. N.; Furtado, R. N. V.; Rosenfeld, A.; Proglhof, J. E. P.; Estrela, G. B. Q.; Natour, J. Ultrasound of Entheses in Ankylosing Spondylitis Patients: The Importance of the Calcaneal and Quadriceps Entheses for Differentiating Patients from Healthy Individuals. Clinics 2019, 74, e727. https://doi.org/10.6061/clinics/2019/e727.