1. Assessment of herd immunity from human papillomavirus vaccination
Johannes A Bogaards, Johannes Berkhof 
The Lancet Infectious Diseases 
Volume 11, Issue 12, (December 2011)
DOI: /S (11)
Copyright © 2011 Elsevier Ltd Terms and Conditions

2. Figure
First-time users of sexual health service clinics and cases of genital warts in Australian heterosexual men, 2004–09
Vaccination period (shaded region) began in July, 2007.
The Lancet Infectious Diseases  , DOI: ( /S (11) )
Copyright © 2011 Elsevier Ltd Terms and Conditions