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  1. Correspondence to Dr Hozefa A Divan, Division of Biostatistics, Department of Preventive Medicine, Keck School of Medicine of the University of Southern California, 1540 Alcazar Street, CHP-222S, MC-90089, Los Angeles, CA, USA; divan{at}
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Divan HA, Kheifets L, Obel C, et al
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Publication history

  • Accepted January 19, 2011
  • First published February 15, 2011.
Online issue publication 
April 04, 2011

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