Transfer of more than two embryos is not recommended (Salha et al., 2000; Ng et al., 2001; Combelles et al., 2005; Elizur et al., 2005; Setti et al., 2005; Heijnen et al., 2006; Clayton et al., 2007; Berin et al., 2010; Sun et al., 2012; Li et al., 2015; Perkins et al., 2015; Bu et al., 2016; Richter et al., 2016; Ruhlmann et al., 2017; Pi et al., 2020; Anzhel et al., 2022; Cirillo et al., 2022).

Strong⊕○○○