Journal article (1999) - J.A. Diderich (author), M Schepper (author), AL Kruckeberg (author), WPM van Hoek (author), Marijke Luttik (author), JP van Dijken (author), J.T. Pronk (author), P. Klaassen (author), HFM Boelens (author), JM Teixeira De Mattos (author), K van Dam (author)