Upper Gastro-Intestinal Endoscopy in Port-Harcourt: An Audit. The Nigerian Health Journal, [S. l.], v. 13, n. 4, p. 192, 2015. DOI: 10.60787/tnhj.v13i4.119. Disponível em: https://tnhjph.com/index.php/tnhj/article/view/119. Acesso em: 13 mar. 2025.