CREATE TABLE table_203_739 (id NUMBER, "rank" NUMBER, "nation" CLOB, "gold" NUMBER, "silver" NUMBER, "bronze" NUMBER, "total" NUMBER)

in the 2003 summer universiade , which three countries had at least 18 bronze medals ?
SELECT "nation" FROM table_203_739 WHERE "bronze" >= 18
SELECT "nation" FROM "table_203_739" WHERE "bronze" >= 18