Financial & competing interests disclosure
D Soldini was supported by the Swiss National Science Foundation and by the Swiss Cancer League. E Campo is supported by the CICYT SAF 08/SAF 2008–03630 and Instituto de Salud Carlos III, ‘Red Temática de Investigación Cooperativa de Cáncer’ (RD06/0020/0039). 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.
No writing assistance was utilized in the production of this manuscript.