Where There is No Echocardiography: an Overview of the Diagnosis of Paediatric Heart Diseases in a New Paediatric Cardiology Unit at the University of Port Harcourt Teaching Hospital. Niger J Paediatr. 2024;34(1&2):36-42. Accessed May 2, 2026. https://www.njpaediatrics.com/index.php/njp/article/view/573