1. Ultrasound-guided embryo transfer: a meta-analysis of randomized controlled trials 
Hassan N Sallam, M.D., Ph.D., F.R.C.O.G., Sameh S Sadek, M.D. 
Fertility and Sterility 
Volume 80, Issue 4, Pages (October 2003)
DOI: /S (03)

2. FIGURE 1
Tree diagram showing the odds ratios of the clinical pregnancy rate for patients with abdominal ultrasound-guided embryo transfer vs. embryo transfer using the clinical touch method.
Sallam. Ultrasound-guided embryo transfer.Fertil Steril 2003.
Fertility and Sterility  , DOI: ( /S (03) )

3. FIGURE 2
Tree diagram showing the odds ratios of the ongoing pregnancy rate for patients with abdominal ultrasound-guided embryo transfer vs. embryo transfer using the clinical touch method.
Sallam. Ultrasound-guided embryo transfer.Fertil Steril 2003.
Fertility and Sterility  , DOI: ( /S (03) )

4. FIGURE 3
Tree diagram showing the odds ratios of the incidence of difficult transfers for patients with abdominal ultrasound-guided embryo transfer vs. embryo transfer using the clinical touch method.
Sallam. Ultrasound-guided embryo transfer.Fertil Steril 2003.
Fertility and Sterility  , DOI: ( /S (03) )