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T. U. KOSUNEN,
A. AROMAA,
P. KNEKT,
A. SALOMAA,
H. RAUTELIN,
P. LOHI
and O. P. HEINONEN
(1997).
Helicobacter antibodies in 1973 and 1994 in the adult population of Vammala, Finland. Epidemiology and Infection,
119
,
pp 29-34