Ovarian superstimulation, transrectal ultrasound-guided oocyte recovery, and IVF in rhinoceros

R Hermes, F Goeritz, TJ Portas, BR Bryant, JM Kelly, LJ Maclellan, T Keeley, F Schwarzenberger, C Walzer, A Schnorrenberg, RE Spindler, J Saragusty, S Kaandorp, TB Hildebrandt