Chagas, C., Fidalgo, P., Martins, A., Barata, A., Leitão, C. N., Mira, F. C. and Ramalho, P. S. (1993) “Value of congenital hypertrophy of the retinal pigment epithelium as diagnostic marker in familial adenomatous polyposis”., Acta Médica Portuguesa. Lisbon, Portugal, 6(7), pp. 303–6. doi: 10.20344/amp.3100.