1. Should embryos developing to blastocysts on day 7 be cryopreserved and transferred: an analysis of pregnancy and implantation rates 
George Kovalevsky, M.D., Stacy M. Carney, B.A., Linda S. Morrison, M.B.A., Caitlin F. Boylan, B.S., Adrienne B. Neithardt, M.D., Ronald F. Feinberg, M.D., Ph.D. 
Fertility and Sterility 
Volume 100, Issue 4, Pages (October 2013)
DOI: /j.fertnstert
Copyright © 2013 American Society for Reproductive Medicine Terms and Conditions

2. Figure 1
Pregnancy and implantation rates according to day of embryo cryopreservation. Only statistically significant P values are reported: *P<.001, #P=.002, ^P=.01.
Fertility and Sterility  , DOI: ( /j.fertnstert )
Copyright © 2013 American Society for Reproductive Medicine Terms and Conditions