Whereas percentages of total CD56+ NK cells were similar across groups (Figure 1E), mature, cytotoxic CD56dim/CD16+ NK cell percentages were significantly lower in participants with LC compared with those who had fully recovered (P = 0.037, Figure 1F); a more pronounced significant reduction was observed in those with severe LC (P = 0.036; Figure 1G). This evidence concerns the gene NCAM1 and laryngotracheoesophageal cleft.