Journal article (2008) - GH van Ramshorst (author), JF Lange (author), R.H.M. Goossens (author), NL Agudelo (author), GJ Kleinrensink (author), Martin Verwaal (author), SFJ Flipsen (author), WCJ Hop (author), L.S.G.L. Wauben (author), J Jeekel (author)