Conflict of interest
All authors declared no conflict of interest regarding this letter. T.K. reports grants and personal fees from Chugai, grants and personal fees from Pfizer, grants and personal fees from ONO, grants from TAIHO, grants and personal fees from Boehringer Ingelheim, grants and personal fees from Eli Lilly, outside the submitted work. E.C.G. reports grants from Shionogi Pharmaceutical Inc., grants from Astellas Pharmaceuticals Inc., grants from Aqua Therapeutics, outside the submitted work.