Name the men doubles for els baert
CREATE TABLE "national_junior_champions" (
  "year" real,
  "mens_singles" text,
  "womens_singles" text,
  "men_doubles" text,
  "womens_doubles" text,
  "mixed_doubles" text
);
SELECT "men_doubles" FROM "national_junior_champions" WHERE "womens_singles"='Els Baert';