When did Robbie Williams enter a rehabilitation centre in Tucson to treat his addiction to prescription pills?

Explanation

Robbie Williams has reportedly battled mental illness, obesity, self-esteem issues, alcoholism, and substance abuse throughout his life. In 2006, he appeared in the documentary "Stephen Fry: The Secret Life of the Manic Depressive" as someone who has battled with the illness for most of his life. He entered a rehabilitation centre in Tucson in February 2007 for his addiction to prescription pills. In 2011 he revealed he had been battling a lethargy caused by a type of hormone imbalance called andropause for a number of years and thought at first it was a return of his depression.