Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_28138035_20 (year_location VARCHAR, mens_doubles VARCHAR)
### Question:
How many years did lin gaoyuan wu jiaji play  mens doubles?
### Answer:
SELECT COUNT(year_location) FROM table_28138035_20 WHERE mens_doubles = "Lin Gaoyuan Wu Jiaji"