RESULTS	After 6 weeks of treatment , the serum levels of 5-HT and BDNF increased ( P < 0.01 ) , and the serum IL-6 level decreased in both groups ( P < 0.05 or P < 0.01 ) , the serum CORT level reduced in the DXP group ( P < 0.01 ) , while the serum NE level elevated in the control group ( P < 0.01 ) .\