Study	Reason for exclusion
Balaban 2005	Quasi‐randomised trial. Randomisation was undertaken according to alternating weekdays
Bungum 2003	Randomised controlled trial comparing implantation and pregnancy rates between two different culture media, both containing HA. Not suitable for this systematic review because this RCT did not compare a treatment group with addition of an adherence compound versus a control group devoid of, or with a lower concentration of, such a compound
Chao 2008	Quasi‐randomised trial. Allocation to treatment or control group was based on consecutive participant list. Every other participant was placed in the treatment group. Information was retrieved by contacting study authors
Chatziioannou 2010	RCT comparing different embryo culture media. Not suitable for this systematic review because this RCT did not compare a treatment group with addition of an adherence compound versus a control group devoid of, or with a lower concentration of, such a compound
Feichtinger 1990	Preliminary trial, not an RCT
Feichtinger 1992	Quasi‐randomised trial. Randomisation to treatment or control arm of the trial was based on the week in which embryo transfer took place
Hambiliki 2010	Quasi‐randomised trial. Randomisation to treatment or control arm of the trial according to alternating weeks
Karimian 2004	Duplication of data from Valojerdi 2006 trial, which was quasi‐randomised as well
Loutradi 2008	Review on trials studying the effect of hyaluronic acid on embryo implantation rates. However, not all reviewed trials were RCTs
Nakagawa 2012	Quasi‐randomised trial. Allocation to different treatment groups was based on odd or even identification numbers
Nakagawa 2012‐II	Conference abstract of quasi‐randomised trial (Nakagawa 2012)
Romano 2004	Randomised controlled trial comparing implantation and pregnancy rates between three different culture media. Not suitable for this systematic review because this RCT did not compare a treatment group with addition of an adherence compound versus a control group devoid of, or with a lower concentration of, such a compound
Sallam 2010	Meta‐analysis of different methods of assisted reproductive technologies, including the use of EmbryoGlue. No data were reported, only lack of evidence of a beneficial treatment effect
Sieren 2006	Randomised controlled trial comparing implantation and pregnancy rates between two different culture media but without studying the specific effect of the addition of HA. This RCT did not compare a treatment group with addition of an adherence compound versus a control group devoid of, or with a lower concentration of, such a compound
Sifer 2009	Randomisation of oocytes instead of participants
Sun 2010	Retrospective analysis
Valojerdi 2006	Quasi‐randomisation. Randomisation to treatment or control group was based on consecutive weekdays
Venetis 2009	RCT comparing different embryo culture media, with similar levels of hyaluronic acid at time of embryo transfer