Table 1. Excluded studies with reasons.
Study	Reason
Ben-Rafael et al., 1995	A fibrin sealant enriched medium was used for embryo transfer in the intervention group.
Chao et al., 2008	Quasi-randomized. Allocation based on the consecutive participant list.
Hambiliki et al., 2010	Quasi-randomized. Allocating based on alternating weeks.
Karimian et al., 2004	Additional reference to Valojerdi et al. (2006).
Kleijkers et al., 2016	HA enriched medium was not tested, Instead, authors have randomly assigned the participants to have their oocytes and embryos cultured in one of the two media: G5 or HTF.
Nakagawa et al., 2012	Quasi-randomized. Allocation based on odd or even ID numbers.
Nakagawa et al., 2023	Prospective observational study.
Nishihara & Morimoto, 2017	Quasi-randomized. Allocation based on the days of the week.
Perez et al., 2019	Quasi-randomized trial. Allocating based on ID number.
Thornton et al., 2018	Not randomized (case control study).
Tomari et al., 2014	Quasi-randomized. Allocation based on the days of the week.
Valojerdi et al., 2006	Quasi-randomized. Allocation based on alternating days.