1. Hysterosalpingo-foam sonography, a less painful procedure for tubal patency testing during fertility workup compared with (serial) hysterosalpingography: a randomized controlled trial 
Kim Dreyer, M.D., Renée Out, M.D., Peter G.A. Hompes, M.D., Ph.D., Velja Mijatovic, M.D., Ph.D. 
Fertility and Sterility 
Volume 102, Issue 3, Pages (September 2014)
DOI: /j.fertnstert
Copyright © 2014 American Society for Reproductive Medicine Terms and Conditions

2. Figure 1 CONSORT statement flow diagram.
Fertility and Sterility  , DOI: ( /j.fertnstert )
Copyright © 2014 American Society for Reproductive Medicine Terms and Conditions