Bone turnover following high-impact exercise is not modulated by collagen supplementation in young men: A randomized cross-over trial
Luuk Hilkens; M Boerboom; N. van Schijndel; J Bons; L.J.C. van Loon; Jan-Willem van Dijk
Supplement- en dopinggebruik in Nederlandse sportscholen: prevalentie en risico's
Luuk Hilkens; N. van Schijndel; T. Maas