Department of Educational Sciences, Vrije Universiteit Amsterdam, Van der Boechorststraat 7, Amsterdam, the Netherlands. f.s.dijkstra@vu.nl. Academy of Health Sciences, Saxion University of Applied Sciences, Handelskade 75, Deventer, the Netherlands. f.s.dijkstra@vu.nl. Faculty of Health, Nutritrion and Sport, The Hague University of Applied Sciences, Johanna Westerdijkplein 75, The Hague, the Netherlands. Department of Human Movement Sciences, Vrije Universiteit Amsterdam, Van der Boechorststraat 7, Amsterdam, the Netherlands. Department of Educational Sciences, Vrije Universiteit Amsterdam, Van der Boechorststraat 7, Amsterdam, the Netherlands. Medical library, Vrije Universiteit Amsterdam, De Boelelaan 1117, Amsterdam, the Netherlands. Department of Anesthesiology, KJF Klinik St. Elisabeth, Müller-Gnadenegg-Weg 4, Neuburg an der Donau, Germany. Department of Anesthesiology, Amsterdam UMC, University of Amsterdam, Meibergdreef 9, Amsterdam, the Netherlands. Research in Education, Amsterdam UMC, Vrije Universiteit Amsterdam, De Boelelaan 1117, Amsterdam, the Netherlands.