1. Monozygotic quadruplets after in vitro fertilization and embryo transfer 
Feng-hua Liu, M.D., Ling He, M.B.B.S., Xiao-lin Long, M.Sc., Xiao-fang Sun, M.B.B.S., Wen-hong Zhang, M.Med.Sci., Xiao-xia Zeng, M.B.B.S., Shao-ying Li, M.Sc., Yong Fan, M.D. 
Fertility and Sterility 
Volume 94, Issue 6, Pages (November 2010)
DOI: /j.fertnstert
Copyright © 2010 American Society for Reproductive Medicine Terms and Conditions

2. Figure 1
The 8th week of pregnancy transvaginal sonogram: a gestational sac with four fetuses (monochorial quadramniotic quadruplets).
Fertility and Sterility  , DOI: ( /j.fertnstert )
Copyright © 2010 American Society for Reproductive Medicine Terms and Conditions

3. Figure 2
The 9th week of pregnancy transvaginal sonogram: a gestational sac with four fetuses (monochorial quadramniotic quadruplets).
Fertility and Sterility  , DOI: ( /j.fertnstert )
Copyright © 2010 American Society for Reproductive Medicine Terms and Conditions

4. Figure 3 The karyotype analysis of the fetuses.
Fertility and Sterility  , DOI: ( /j.fertnstert )
Copyright © 2010 American Society for Reproductive Medicine Terms and Conditions