Article History
First Online: 4 January 2019
Competing interests
: D.M. declares that he has received research grants from Abbvie, Celgene, Janssen, Merck, Novartis and Pfizer and has acted as a consultant for or received honoraria from Abbvie, Celgene, Eli Lilly, Janssen, Merck, Novartis, Pfizer and UCB. A.L.T. declares she has acted as a consultant for or received honoraria from Abbvie, Eli Lilly, Janssen, Novartis and Pfizer. P.H. declares that he has received research grants from Abbvie and Janssen and has acted as a consultant for or received honoraria from Abbvie, Amgen, Celgene, Galapagos, Janssen, Novartis, Pfizer and UCB. A.W. declares no competing interests.