Declaration of interest
G.J.M received consultancy fees from OMEGA Pharma, Danon-Hellas, AbbVie, MSD – International, MSD Hellas; lecture fees from OMEGA Pharma, Angelini, Ferring; expert testimonies from AbbVie, OMEGA Pharma, MSD Hellas; advisory fees from AbbVie, MSD – International, MSD Hellas and financial support for research from Menarini Hellas, AbbVie, MSD Hellas. The other authors declare no conflicts of interest.