von Wolff, Michael; Kollmann, Zahraa; Flück, Christa E.; Stute, Petra; Marti, U.; Weiss, B.; Bersinger, Nick A. (2014). Gonadotrophin stimulation for in vitro fertilization significantly alters the hormone milieu in follicular fluid: a comparative study between natural cycle IVF and conventional IVF. Human reproduction, 29(5), pp. 1049-1057. Oxford University Press 10.1093/humrep/deu044