RAY-OFFOR, Emeka; OBIORAH, Christopher. Upper gastro-intestinal endoscopy in Port-Harcourt, Nigeria: an Audit. The Nigerian Health Journal, Nigeria, v. 14, n. 3, p. 134, 2015. DOI: 10.60787/tnhj.v14i3.171. Disponível em: https://www.tnhjph.com/index.php/tnhj/article/view/171. Acesso em: 25 nov. 2025.