There were studies measuring the effects of NTCT on depressive syndromes (n=12) [15, 16, 24–26, 28–31], cortisol (n=2) [27, 29], 5-HT (n=3) [21, 24, 27], G-protein (n=1) [26], cytokine (n=3) [21, 22, 28], brain functional connectivity (n=2) [15, 16], brain activity (n=1) [25], CRP (n=1) [30], and HRV (n=1) [23]. Here, CRP is linked to depressive disorder.