What was the world rank by QS in 2013 for the University of Otago?
CREATE TABLE "universities" (
  "members" text,
  "country" text,
  "year_established" real,
  "world_rank_by_the_wur_2013" text,
  "world_rank_by_arwu_2013" text,
  "world_rank_by_qs_2013" text
);
SELECT "world_rank_by_qs_2013" FROM "universities" WHERE "members"='University of Otago';