CREATE TABLE table_30319 ("Year Location" TEXT, "Mens Singles" TEXT, "Womens Singles" TEXT, "Mens Doubles" TEXT, "Womens Doubles" TEXT)

Who won the mens doubles at the 2006 guangzhou event?
SELECT "Mens Doubles" FROM table_30319 WHERE "Year Location" = '2006 Guangzhou'
SELECT "Mens Doubles" FROM "table_30319" WHERE "Year Location" = '2006 Guangzhou'