1. Aging of the gastrointestinal system;Baime,1994
2. Gastrointestinal disease in the aged;Norton,1995
3. Gastroenterologic disorders;Shaker,1998
4. Enfermedad por reflujo gastroesofágico;González Guerrero,2001
5. The aging esophagus;Sallout;Clin Geriatr Med,1999