title: Achalasia. New concepts.
authors.affiliation: Servicio de Aparato Digestivo, Hospital Clínico San Carlos, Madrid, España. Electronic address: aruizdeleon@gmail.com.
authors.forename: Antonio
authors.initials: A
authors.lastname: Ruiz de León San Juan
authors.affiliation: Servicio de Aparato Digestivo, Hospital Clínico San Carlos, Madrid, España.
authors.forename: Julio
authors.initials: J
authors.lastname: Pérez de la Serna Y Bueno
mesh_terms: D004931:Esophageal Achalasia / Q000175:diagnosis / Q000209:etiology / Q000628:therapy; D006801:Humans