Self-report questionnaires on depressive symptoms ( CES-D ; primary outcome ) , burnout ( Maslach Burnout Inventory , MBI ) , work performance ( Health and Work Performance Questionnaire , HPQ ) , duration of absenteeism , and anxiety ( Hospital Anxiety and Depression Scale , HADS ; secondary outcomes ) , were completed at baseline , posttreatment , and at @ - , and @-month follow-up .