Kolibianakis 2004.

Study characteristics
Methods	Study type: randomised controlled trial in parallel groups Country: Belgium
Participants	Number of participants randomised: 460 Age: BS 31.5 and CS 31.1 years Number of previous treatments: BS 0.8 and CS 0.7 Infertility duration: not stated Prognosis: unselected participants Inclusion criteria: women under 43 years of age and an indication for IVF Exclusion criteria: preimplantation genetic screening and azoospermia.
Interventions	BS group: N = 226 CS group (day 3): N = 234 Description of the cycles: Two ovarian stimulation protocols were used in the present study. Initially, the long protocol (down‐regulation with GnRH agonist and stimulation with rFSH). A combination of GnRH antagonist and recombinant gonadotropins was introduced in turn, and gradually replaced the long agonist protocol. Embryos were cultured in sequential media G1/G2 (Vitrolife, Goethenburg,Sweden). To support luteal phase, all participants received progesterone suppository.
Outcomes	Clinical pregnancy rate Miscarriage rate Embryo freezing rate Failure to transfer embryos
Notes	Prognosis: mixed unselected