Journal article (1999) - MA van Uden (author) , RJL van der Meer (author) , HW Willering (author) , KG Bauer (author) , M Bron (author) , R Buis (author) , PJM de Groen (author) , Y Lefevere (author) , GJL Nooren (author) , H Postma (author) , G van der Steenhoven (author)