“…Overall, the studies included 2596 CDH patients. The mean number of index CDH patients was 96 per publication (range 5-691); 13/27 studies were RCTs, [13][14][15][16][17][18][19][20][21][22][23][24][25] and 14/27 were observational studies [26][27][28][29][30][31][32][33][34][35][36][37][38][39] ; 7/27 studies were multicentre collaborative works. Studies emerged from a variety of countries worldwide including the UK, Netherlands, Belgium, USA, Canada, Japan, Egypt, and Australia.…”