AHMAD, Khawaja Khurshid; SHAUKAT, Asim; ALI, Muhammad; AMIN, Yasser; QADEER, Tahir; AHMAD, Sarfraz. Is secondary achalasia a reality? Primary versus secondary achalasia: Role of barium swallow. Annals of King Edward Medical University, [S. l.], v. 9, n. 4, 2016. DOI: 10.21649/akemu.v9i4.1375. Disponível em: https://www.annalskemu.org/journal/index.php/annals/article/view/1375. Acesso em: 29 mar. 2024.