Who held the Intergiro classificaiton when the Trofeo Fast Team is gb-mg maglificio?
CREATE TABLE "classification_leadership_by_stage" (
  "stage" text,
  "winner" text,
  "general_classification" text,
  "points_classification" text,
  "mountains_classification" text,
  "young_rider_classification" text,
  "intergiro_classification" text,
  "trofeo_fast_team" text
);
SELECT "intergiro_classification" FROM "classification_leadership_by_stage" WHERE "trofeo_fast_team"='gb-mg maglificio';