Endogenous pain modulation by heterotopic foot stimulation reduced gastric pain by 6.5 ( -0.7 to 13.6 ) in controls ( p = 0.07 ) and by 7.1 ( -2.29 to 16.47 ) in FD ( p = 0.1 ) , with no significant difference in EPM between controls and FD ( -2.0 [ -14.5 to 10.5 ] ; p = 0.75 ) .