The medical proof doesn't get much better than VMMC.
Venter F, Rees H, Pillay Y, Simelela N, Mbengashe TM, Geffen N, Conradie F, Shisana O, Rech D, Serenata C, Taljaard D, Gray G.
Venter F, et al. Among authors: rees h.
S Afr Med J. 2012 Feb 23;102(3 Pt 1):124-5; discussion 125-6. doi: 10.7196/samj.5682.
S Afr Med J. 2012.
PMID: 22380896
No abstract available.