OXT and complex regional pain syndrome: Saliva oxytocin levels were higher in CRPS patients compared to HC and increased after 1 week of L4-DRGSTIM (trial phase) and after 3 months L4-DRGSTIM (HC: 30.45 ± 14.38 pg/ml versus pre–DRGSTIM: 32.58 ± 13.0 pg/ml versus post-DRGSTIM 1 week: 55.35 ± 75.01 pg/ml versus post DRGSTIM 3 months: 59.82 ± 41.89 pg/ml; p = 0.65) (Fig. 10).