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Van Ditzhuijsen TJ, de Witte-van der Schoot E, van Loon AM, Rijntjes PJ, Yap SH. Hepatitis B virus infection in an institution for the mentally retarded. Am J Epidemiol. 1988 Sep;128(3):629-38.
Van Ditzhuijsen TJ, de Witte-van der Schoot E, van Loon AM, Rijntjes PJ, Yap SH. Hepatitis B virus infection in an institution for the mentally retarded. Am J Epidemiol. 1988 Sep;128(3):629-38.