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- Sonsky, J. (author), Valk, H. (author), Huizenga, J. (author), Hollander, R.W. (author), van Eijk, C.W.E. (author), Sarro, P.M. (author) journal article 1999
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- Sonsky, J. (author), Valk, H. (author), Allier, C.P. (author), Hollander, R.W. (author), van Eijk, C.W.E. (author), Sarro, P.M. (author) journal article 1999