CCL@ serum levels were significantly lower in ventilated-group patients on POD-@ ( @ -LSB- @ -RSB- vs. @ -LSB- @ -RSB- ; p = @ ) , POD-@ ( @ -LSB- @ -RSB- vs. @ -LSB- @ -RSB- ; p = @ ) , POD-@ ( @ -LSB- @ -RSB- vs. @ -LSB- @ -RSB- ; p = @ ) , and POD-@ ( @ -LSB- @ -RSB- vs. @ -LSB- @ -RSB- ; p = @ ) .