The etiology of oral aphthous ulcers has been associated with all the following except:
a. Crohn's disease
b. Nontropical sprue
c. Iron deficiency
d. Ethanol intake
e. Folic acid deficiency
D
Health Professions
a. Crohn's disease
b. Nontropical sprue
c. Iron deficiency
d. Ethanol intake
e. Folic acid deficiency
D