Hepatitis B vaccination in mentally retarded: Effectiveness after 11 years1To whom it may concern I declare that the parents (guardian) of all subjects have given informed consent and that the study was approved by the ethical committee of the University of Antwerp, in 1985.1
Journal article published in 1999 by
A. Vellinga 
,
P. Van Damme,
J. J. Weyler,
R. Vranckx,
A. Meheus
,
P. Van Damme,
J. J. Weyler,
R. Vranckx,
A. Meheus
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