Journal article (2013) - Olaf Schijns (author), M van Kroonenburgh (author), Freek J. Beekman (author), Frederik J. Beekman (author), F.J. Beekman (author), Freek Beekman (author), F. J. Beekman (author), J. Verbeek (author), J Herscheid (author), K Rijkers (author), V Visser-VandeWalle (author), G Hoogland (author)