Who was the runner up the season that Sagawa Express came in fourth?
CREATE TABLE "japan_football_league_jfl_1999_2013" (
  "season" real,
  "winner" text,
  "runner_up" text,
  "third_place" text,
  "fourth_place" text
);
SELECT "runner_up" FROM "japan_football_league_jfl_1999_2013" WHERE "fourth_place"='Sagawa Express';