ALTER, M. J.; MARGOLIS, H. S.; KRAWCZYNSKI, K.; JUDSON, F. N.; MARES, A.; ALEXANDER, W. J.; PIN, Y. H.; MILLER, J. K.; GERBER, M. A.; SAMPLINER, R. E.; MEEKS, E. L.; BEACH, M. J. for the Sentinel Counties Chronic Non-A, Non-B Hepatitis Study Team Author Information
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Alter et al. (1993) studied this question.