From the *Public Health England, Health and Wellbeing Directorate, London, UK; and †Centers for Disease Control and Prevention, National Center for HIV/AIDS, Viral Hepatitis, STD, and TB Prevention, Atlanta, GA.
The findings and conclusions in this article are those of the authors and do not necessarily reflect the official position of the Centers for Disease Control and Prevention.
Conflicts of interest do not exist for any of the listed authors.
Correspondence: Kevin A. Fenton, MD, PhD, FFPH, Public Health England, Wellington House, 133-155 Waterloo Rd, London, SE1 8UG, UK. E-mail: Kevin.Fenton@phe.gov.uk.
Received for publication May 15, 2013, and accepted May 16, 2013.