Financial & competing interests disclosure
This work was supported by Programma Nazionale Ricerca sull’AIDS 2006 from Istituto Superiore di Sanità (grant 30G.31). 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.