Presence of a protective allele for achalasia on the central region of the major histocompatibility complex

1. De La Concha, E.G.
2. Fernandez-Arquero, M.
3. Conejero, L.
4. Lazaro, F.
5. Mendoza, J.L.
6. Sevilla, M.C.
7. Diaz-Rubio, M.
8. Ruiz De Leon, A.