The American Journal of Epidemiology (ISSN 0002-9262) is published ntwice a month, 24 times a year in 2 volumes (12 issues per volume), by Oxford nUniversity Press, 2001 Evans Road, Cary, NC 27513-2009, for the Johns Hopkins nBloomberg School of Public Health and is sponsored by the Society for nEpidemiologic Research. Info rmation for authors appears on the Journal’s home npage at www.aje.oxfordjournals.org. Authors should consult these instructions nbefore submitting manuscripts.
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