“…Forty-nine papers were excluded from the review for age-related reasons: six studies had 0–3 patients under age 50. Forty-three studies included patients under age 50 but did not present results stratified by age or did not stratify using an age ≤50 years old for stratification; one study provided above/below-age data but failed to include symbols (≥ or ≤) or descriptive text to indicate which group included the cutoff age (Sternberg et al , 1994; Nakae et al , 1995; Nakamura et al , 1999; Akasu et al , 2000; el-Ghazawy et al , 2001; Luna-Pérez et al , 2002; Al-Shamsi et al , 2003; Kanemitsu et al , 2003; Carmignani et al , 2004; Lloyd et al , 2006; Nervi et al , 2006; Lawson et al , 2008; Sobhani et al , 2008; Song et al , 2009; Aghili et al , 2010; Lemmens et al , 2011; Sjo et al , 2011; Lieu et al ., 2014; Park et al , 2014; Saluja et al , 2014; Adachi et al , 2015; Lam et al , 2015; Sica et al , 2015; Simkens et al , 2015; 2016; Maillet et al , 2016; Wang et al , 2016; Cicero et al , 2017; Hojo et al , 2017; Patil et al , 2017; Cigdem Arslan et al , 2018; Kondo et al , 2021; Melli et al , 2021; Rieser et al , 2021a, 2021b; Sharma et al , 2021; Tabchouri et al , 2021; Yang et al , 2021; Zhou et al , 2021; Flood et al , 2022; Iwasaki et al , 2022; McCleary et al , 2022; Meyer et al , 2022; Nagao et al , 2022).…”