“…Five samples, two from Germany (Beckmann et al., 2019; Kliem et al., 2018) and three from Spain (Calvete et al., 2016; Cava et al., 2015; Cava, Martínez‐Ferrer, et al., 2020), met all criteria of quality and achieved a total score of 0. Six samples, one from Germany (Blättner et al., 2015), two from Spain (Dosil et al., 2019; Fernández‐González et al., 2013), two from the United Kingdom (Stanley et al., 2018; Young et al., 2018), and one from Italy (Stanley et al., 2018) scored 4, and three further samples, one from Belgium (Glowacz et al., 2018), one from Portugal (Dixe et al., 2020), and one from Spain (Sebastián et al., 2014), scored 5. All other studies presented 1, 2, or 3 points.…”