The Ontario government has filed a defence against a claim made by a Hamilton woman who's at the centre of the U.S. debate over health care. Shona Holmes is featured in a TV campaign in which she claims she had to mortgage her home and travel to a U.S. clinic for brain surgery in 2005, due to a six-month wait for care in Canada. The ad, which began airing about two weeks ago in all 50 states, warns Americans to reject Canadian-style health care because it failed her. In the ad, Ms. Holmes states that if she relied on her...