Adequate	Inadequate	Unclear
Generation of allocation sequence	Aboab 2008; Annane 2002; Annane 2010; Annane 2018; Arabi 2011; Blum 2015; Bollaert 1998; Bone 1987; Briegel 1999; Chawla 1999; Cicarelli 2007; Confalonieri 2005; Fernández‐Serrano 2011; Gordon 2014; Gordon 2016; Huang 2014; Hyvernat 2016; Keh 2003; Keh 2016; Klastersky 1971; Liu 2012; Luce 1988; Lv 2017; Meduri 2007; Meduri 2009; Meijvis 2011; Menon 2017; Mirea 2014; Nagy 2013; Ngaosuwan 2018; Oppert 2005; Rinaldi 2006; Slusher 1996; Snijders 2010; Sprung 1984; Sprung 2008; Tagaro 2017; Tilouche 2019; Tongyoo 2016; Torres 2015; VASSCSG 1987; Venkatesh 2018; Yildiz 2002; Yildiz 2011	Lucas 1984; Schumer 1976; Wagner 1955	CSG 1963; Doluee 2018; El Ghamrawy 2006; El‐Nawawy 2017; Hu 2009; Huh 2007; Kurungundla 2008; Li 2016; Loisa 2007; McHardy 1972; Mikami 2007; Nafae 2013; Rezk 2013; Sabry 2011; Sui 2013; Tandan 2005; Valoor 2009
Allocation concealment	Aboab 2008; Annane 2002; Annane 2010; Annane 2018; Arabi 2011; Blum 2015; Bollaert 1998; Bone 1987; Briegel 1999; Chawla 1999; Cicarelli 2007; Confalonieri 2005; CSG 1963; Doluee 2018; Fernández‐Serrano 2011; Gordon 2014; Gordon 2016; Hyvernat 2016; Keh 2003; Keh 2016; Klastersky 1971; Luce 1988; Lv 2017; McHardy 1972; Meduri 2007; Meduri 2009; Meijvis 2011; Menon 2017; Oppert 2005; Rinaldi 2006; Slusher 1996; Snijders 2010; Sprung 2008; Tagaro 2017; Tilouche 2019; Tongyoo 2016; Torres 2015; VASSCSG 1987; Venkatesh 2018; Yildiz 2002; Yildiz 2011	Lucas 1984; Nagy 2013; Schumer 1976; Sprung 1984; Wagner 1955	El Ghamrawy 2006; El‐Nawawy 2017; Hu 2009; Huang 2014; Huh 2007; Kurungundla 2008; Li 2016; Liu 2012; Loisa 2007; Mikami 2007; Mirea 2014; Nafae 2013; Ngaosuwan 2018; Rezk 2013; Sabry 2011; Sui 2013; Tandan 2005; Valoor 2009; Zhou 2015
Blinding	Aboab 2008; Annane 2002; Annane 2018; Arabi 2011; Blum 2015; Bollaert 1998; Bone 1987; Briegel 1999; Chawla 1999; Cicarelli 2007; Confalonieri 2005; El‐Nawawy 2017; Fernández‐Serrano 2011; Huh 2007; Hyvernat 2016; Keh 2003; Klastersky 1971; Luce 1988; Lv 2017; Meduri 2007; Meduri 2009; Meijvis 2011; Menon 2017; Mikami 2007; Ngaosuwan 2018; Oppert 2005; Rinaldi 2006; Slusher 1996; Snijders 2010; Sprung 2008; Tagaro 2017; Tandan 2005; Tongyoo 2016; Torres 2015; VASSCSG 1987; Venkatesh 2018; Yildiz 2002; Yildiz 2011	Annane 2010; Huang 2014; Li 2016; Lucas 1984; McHardy 1972; Mikami 2007; Mirea 2014; Nagy 2013; Sprung 1984; Sui 2013; Tilouche 2019; Valoor 2009; Wagner 1955; Zhou 2015	CSG 1963; El Ghamrawy 2006; Doluee 2018; Hu 2009; Kurungundla 2008; Liu 2012; Loisa 2007; Nafae 2013; Rezk 2013; Sabry 2011; Schumer 1976
Loss to follow‐up	Aboab 2008; Annane 2002; Annane 2010; Annane 2018; Arabi 2011; Blum 2015; Bollaert 1998; Briegel 1999; Doluee 2018; El Ghamrawy 2006; El‐Nawawy 2017; Hu 2009; Huang 2014; Hyvernat 2016; Keh 2003; Lucas 1984; Lv 2017; McHardy 1972; Meduri 2007; Meduri 2009; Meijvis 2011; Menon 2017; Mirea 2014; Nagy 2013; Ngaosuwan 2018; Rezk 2013; Sabry 2011; Snijders 2010; Sprung 2008; Tagaro 2017; Tilouche 2019; Tongyoo 2016; Torres 2015; Valoor 2009; VASSCSG 1987; Venkatesh 2018; Yildiz 2011	Fernández‐Serrano 2011	Bone 1987; Chawla 1999; Cicarelli 2007; Confalonieri 2005; CSG 1963; Huh 2007; Klastersky 1971; Kurungundla 2008; Li 2016; Liu 2012; Loisa 2007; Luce 1988; Mikami 2007; Nafae 2013; Oppert 2005; Rinaldi 2006; Schumer 1976; Slusher 1996; Sprung 1984; Sui 2013; Tandan 2005; Zhou 2015