Article History
Received: 17 December 2018
Accepted: 14 February 2019
First Online: 20 February 2019
Compliance with ethical standards
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: F.J. reports Grant support from Eli Lilly, and personal fees for consultancy from Eli Lilly, Roche, Merck, Janssen Pharmaceutica, Biogen, Danone and AC Immune. All other authors declare that they have no conflict of interest.