Bibliographical noteFunding Information:
James M. Robins is Professor of Epidemiology and Biostatistics and Andrea Rotnitzky is Associate Professor of Biostatistics, Havard School of Public Health, Boston, MA 02115. Mark van der Laan is Associate Professor, School of Public Health, University of California, Berkeley, CA. This research was supported by NIH grants ROlAI32475 and ROlGM48704-07.
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