user: Question: Who won the men's double when Chou Tien-chen won the men's single?
Columns: ['Year', 'Mens singles', 'Womens singles', 'Mens doubles', 'Womens doubles', 'Mixed doubles']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [1988.0, 'Kim Brodersen', 'Katrin Schmidt', 'Markus Keck Robert Neumann', 'Katrin Schmidt Nicole Baldewein', 'Markus Keck Katrin Schmidt']
SQL:

assistant: SELECT "Mens doubles" FROM "Table" WHERE "Mens singles" = 'Chou Tien-chen';