There was no difference in the proportion of wounds that were closed surgically ( @-mmHg group , @ percent ; @-mmHg group , @ percent ) , wounds that demonstrated @ percent wound area reduction ( @-mmHg group , @ percent ; @-mmHg group , @ percent ) , or wounds that demonstrated @ percent wound volume reduction after @ weeks of therapy ( @-mmHg group , @ percent ; @-mmHg group , @ percent ) .