SIH is funded by a Senior Research Fellowship from the Wellcome Trust (#095066). SIH
also acknowledges support from the RAPIDD program of the Science & Technology Directorate,
Department of Homeland Security, and the Fogarty International Center, National Institutes
of Health (
http://www.fic.nih.gov). CLM is funded by a Wellcome Trust grant (#091835). JSB is supported by funding
from the National Institutes of Health National Library of Medicine grants G08 LM009776
and R01 LM010812. The funders had no role in study design, data collection and analysis,
decision to publish, or preparation of the manuscript.