Conflict of interest: COI declared -see note COI notes: V.M. received research grants from MSD/ Gilead and speakership from MSD, Gilead, Pfizer, Novartis, Jazz, Incyte. E.T. declares advisory boards for Celgene, Gilead/Kite, Jazz, Novartis, Pfizer and MSD, speaker fees for Gilead/Kite, Janssen, Jazz, Novartis and Pfizer and consultancy for educational materials for Gilead/Kite. A.P. declares advisory board for MSD. R.L. received educational grants and speaker fees for MSD, Chugai Pharma, Astellas, Gilead, Sanofi. E.N. declares advisory boards for Kite/Gilead, Novartis, BMS/Celgene, Pfizer and conference support for Kite/Gilead, Novartis and speaker fees for Kite/Gilead. J.A.S. declares honoraria for educational events supported by Jazz, Mallinckrodt, Gilead, Janssen, and Actelion, advisory board participation for Medac and IDMC membership for a Kiadis Pharma supported clinical trial, none of which are directly related to this study. E.H.