“…These studies belonged to eight types – see Figure 1. For example, of these 27 included studies, two RCTs (Bairati et al, 2005; Chitra & Shyamaladevi, 2011)—see Table 1, two were systematic reviews (Kolokythas et al, 2019a; Martos‐Fernández et al, 2018)—see Table 2, six were retrospective studies (D’Souza et al, 2014; Hayashi et al, 2015; McLeod et al, 2012; Patel et al, 2016, 2021; Robard et al, 2014)—see Table 3, five were observational studies (i.e. one study was a cross‐sectional study (Dhanda et al, 2018), two were prospective studies (Delanian et al, 2005, 2011), and two were pilot studies (Bulsara et al, 2019; Futran et al, 1997))—see Table 4, seven were narrative reviews (Costa et al, 2016; Haroun & Coblens, 2019; Lyons & Brennan, 2017; Lyons & Ghazali, 2008; McCaul, 2014; Patel & McGurk, 2017; Rivero et al, 2017)—see Table 5, four articles were case reports (Bohn et al, 2016; Breik et al, 2019; Kahenasa et al, 2012; Leoncini et al, 2014)—see Table 6, and lastly one was an in ‐ vitro study (Nguyen et al, 2019)—see Table 7.…”