1. Nulliparity, fertility treatments and twins: a time for rethinking
Arie Berkovitz, M.D., Anat Hershko-Klement, M.D., Moshe Fejgin, M.D. 
Fertility and Sterility 
Volume 93, Issue 6, Pages (April 2010)
DOI: /j.fertnstert
Copyright © 2010 American Society for Reproductive Medicine Terms and Conditions

2. Figure 1
Adapted survival curves of multiparas (continuous line) and nulliparas (interrupted line) relating to week at termination of pregnancy (starting from week 14).
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Fertility and Sterility  , DOI: ( /j.fertnstert )
Copyright © 2010 American Society for Reproductive Medicine Terms and Conditions