title: Viral hepatitis among American missionaries abroad. A preliminary study.
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D002675:Child, Preschool; D006506:Hepatitis A; D006801:Humans; D008875:Middle Aged; D066189:Missionaries; D008921:Religious Missions; D012189:Retrospective Studies; D014481:United States