Nutritional supplement use by Dutch elite and sub-elite athletes: Does receiving dietary counseling make a difference? - Wardenaar, F. C.; Ceelen, I. J. M.; van Dijk, J.-W.; Hangelbroek, R. W. J.; Van Roy, L.; Van der Pouw, B.; De Vries, J. H. M.; Mensink, M.; Witkamp, R. F. (International Journal of Sport Nutrition and Exercise Metabolism, 2017)