When the winner was Alessandro Ballan, how many total team classifications were there?
CREATE TABLE "classification_leadership_by_stage" (
  "stage" real,
  "winner" text,
  "general_classification" text,
  "points_classification" text,
  "mountains_classification" text,
  "combination_classification" text,
  "team_classification" text
);
SELECT COUNT("team_classification") FROM "classification_leadership_by_stage" WHERE "winner"='Alessandro Ballan';