Ankylosing spondylitis has a predisposition for the development of sarcopenia in the upper extremities: A single-center observational study. Actas Médicas (Ecuador), [S. l.], v. 33, n. 2, p. 119–127, 2023. DOI: 10.61284/145. Disponível em: https://actasmedicas.ec/index.php/am/article/view/145.. Acesso em: 18 dec. 2025.