Achalasia in children: treatment by anterior esophageal myotomy (modified Heller operation).
Lemmer JH, Coran AG, Wesley JR, Polley TZ, Byrne WJ. Achalasia in children: treatment by anterior esophageal myotomy (modified Heller operation). J Pediatr Surg. 1985 Aug; 20(4):333-8.