title: Suggested association of NOS2A polymorphism in idiopathic achalasia: no evidence in a large case-control study.
authors.forename: Ana González
authors.initials: AG
authors.lastname: Vigo
authors.forename: Alfonso
authors.initials: A
authors.lastname: Martínez
authors.forename: Emilio G
authors.initials: EG
authors.lastname: de la Concha
authors.forename: Elena
authors.initials: E
authors.lastname: Urcelay
authors.forename: Antonio
authors.initials: A
authors.lastname: Ruiz de León