First Online: 12 February 2020
Compliance with Ethical Standards
: No funding was received for the preparation of this letter.
: Hennie G. Raterman has received an unrestricted educational grant from UCB, and consulting fees from Amgen, Cellgene and Sanof Genzyme. Willem F. Lems has received a grant from Pfzer, and consulting fees from MSD, Amgen, Lilly, Pfzer and UCB.