First Online: 16 June 2015
: N.V.C. is a Postdoctoral Fellow of the Research Foundation-Flanders (FWO), Belgium, received consultancy fees from Janssen Biologics BV, MSD, Pfizer and UCB, and speaker's fees from Abbvie. W.J.S. received research support and consultancy fees from Abbvie, Amgen, Janssen and Pfizer, and consultancy fees from UCB.