Conflict of interest
J.-S. F. reports personal fees and non-financial support from Roche, AstraZeneca, Novartis and Pfizer, personal fees from Lilly, GSK and ESAI; T. B. reports grants, personal fees and non-financial support from Novartis, AstraZeneca, and Pfizer, personal fees and non-financial support from Roche, personal fees from SeattleGenetics; C. G. T. reports grants from Roche, personal fees from Astrazeneca, Pfizer and Lilly, non-financial support from MSD and Pfizer; H. S. reports personal fees and non-financial support from Pierre Fabre and Pfizer, personal fees from Novartis and AstraZeneca, non-financial support from Roche; P.-E. H. reports grants from Pfizer, Novartis and Astrazeneca. The other authors declare no conflict of interest.