Implications of serum pepsinogen I in early endoscopic diagnosis of gastric cancer and dysplasia. Helsinki Gastritis Study Group.
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D. Albanes | J. Virtamo | P. Taylor | J. Huttunen | O. Heinonen | P. Sipponen | M. Härkönen | I. Samloff | K. Varis | F. Laxén | N. Sande