Filho HM, Thom AF, Martins LRF. Preliminary results using technetium-99m scintigraphy in the study of megaesophagus. Concise Communication. Rev. Inst. Med. Trop. São Paulo. 1980;22(4):209-211. Accessed March 16, 2025. https://revistas.usp.br/rimtsp/article/view/197316