The laparoscopic Heller-Dor operation remains an effective treatment for esophageal achalasia at a minimum 6-year follow-up. - Costantini,M.; Zaninotto,G.; Guirroli,E.; Rizzetto,C.; Portale,G.; Ruol,A.; Nicoletti,L.; Ancona,E. (Surg Endosc, 2005)