Purpose of study :
ISEE-471 The Effect of the WTC Tragedy on Pregnancy Outcomes Sally Ann Lederman, PhD 1 , Lisa Weiss, MPH 1 , Deliang Tang, MD, DrPH 1 , Howard Andrews, PhD 1 , Virginia Rauh, ScD 1 , Mark Becker, MA 2 , Richard Wang DO 3 , Frederica Perera, DrPH 1 .
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