Determine if the sentence is true based on the text below:
Some participants took steroids before the event

The 1999 Acura Classic Doubles was the doubles event of the twentieth edition of the third tournament in the US Open Series. Martina Hingis and Natasha Zvereva were the defending champions but Hingis did not compete this year. Zvereva played with Mary Pierce, and they were defeated in the first time by Cara Black and Irina Selyutina.
It's impossible to say