Effects of pneumatic dilation in the treatment of achalasia - YAŞA, M. Hadi; ÖRMECİ, Necati and BEKTAŞ, Ahmet and BEYLER, A. Reşit and KESİM, Erol and DÖKMECİ, Abdülkadir and UZUNALİMOĞLU, Özden (Turkish Journal of Gastroenterology, 1998)