Upper gastrointestinal bleeding associated with preferential COX-2 inhibitors: A case report. Actas Médicas (Ecuador), [S. l.], v. 33, n. S1, p. 10, 2023. DOI: 10.61284/157. Disponível em: http://actasmedicas.ec/index.php/am/article/view/157.. Acesso em: 30 may. 2026.