pubmed:affiliation |
Department of Epidemiology, School of Hygiene and Public Health, Johns Hopkins University, Baltimore, MD 21205, USA. jsamet@jhsph.edu
|
pubmed:publicationType |
Journal Article,
Research Support, U.S. Gov't, P.H.S.,
Research Support, U.S. Gov't, Non-P.H.S.,
Research Support, Non-U.S. Gov't
|