Cortez-Pinto, Helena, M. Lourdes Tavares, M. Ermelinda Camilo, and Miguel Carneiro de Moura. 1997. “Long-Term Enteral Nutrition by Percutaneous Endoscopic Gastrostomy”. Internal Medicine 4 (2). Lisboa, Portugal:89-91. https://revista.spmi.pt/index.php/rpmi/article/view/2204.