“…After reading the full text of the relevant articles, a total of 43 studies were found to meet the inclusion criteria for this systematic review. Of these, 33 articles were deemed suitable for inclusion based on their methodology: 20 cohort studies (Nee et al, 1980;Stefl, 1984;Robertson et al, 1989;Wand et al, 1993;Berthier et al, 1998;Lichter et al, 1999;Freeman et al, 2000;Cath et al, 2001;Robertson et al, 2002;Ohta and Kano, 2003;Eapen et al, 2004;Mathews et al, 2004;Martino et al, 2007;Robertson et al, 2008;Haddad et al, 2009;Kano et al, 2010;Szejko et al, 2019), 1 combined cohort study plus case series (Cheung et al, 2007), 2 case series (Muller-Vahl et al, 2000;Cavanna et al, 2010), and 10 case reports Anandan et al, 2004;Hood et al, 2004;Lim et al, 2004;Leksell and Edvardson, 2005;Bajwa et al, 2007;Banda et al, 2009;Cavanna et al, 2009;Duits et al, 2012;Fornaro et al, 2012). The process leading to the identification, screening, assessment of eligibility, and inclusion of studies is summarised in a PRISMA flow chart (Moher et al, 2009) (Figure 1).…”