Declaration of interest
N Katsiki has given talks, attended conferences and participated in trials sponsored by Amgen, Angelini, Astra Zeneca, Boehringer Ingelheim, MSD, Novartis, Novo Nordisk and Sanofi. P Perez-Martinez has given talks and participated in trials sponsored by Bristol-Myers Squibb/Astra Zeneca, Merck Sharp & Dohme, Boehringer Ingelheim, Eli Lilly, Novartis, Ferrer, Esteve, GlaxoSmithKline, Pfizer, Janssen-Cilag, Amgen and Sanofi. The authors have no other relevant affiliations or financial involvement with any organization or entity with a financial interest in or financial conflict with the subject matter or materials discussed in the manuscript apart from those disclosed.