Participants were randomly divided into @ groups : ( @ ) AL ( n = @ ) , which included the application of active IFC combined with a limited TA ; ( @ ) SL ( n = @ ) , which received sham IFC combined with a limited TA ; ( @ ) AE ( n = @ ) , which received active IFC combined with an enhanced TA ; and ( @ ) SE ( n = @ ) , which received sham IFC combined with an enhanced TA .