Viegas, P., Augusto, V., Sousa, J., Wai, F. S. and Fonseca Ferreira, F. (1999) “Megaloblastic anaemia caused by a nutritional deficit of vitamin B12”, Internal Medicine. Lisboa, Portugal, 6(4), pp. 264–268. Available at: https://revista.spmi.pt/index.php/rpmi/article/view/2088 (Accessed: 3 April 2025).