Supervisor of external PhD student H.E. Booij-Vrieling: "Tooth resorption in cats. Contribution of vitamin D and inflammation. Promotors/co-promotor: prof.dr. H.A.W. Hazewinkel, prof.dr. V. Everts; dr. L.C. Penning, Tryfonidou, Universiteit van Utrecht, 20-04-2010