Iran's former prime minister Mir Hossein Mousavi, who was the focus of a 2009 mass protest movement and has spent the last 15 years under house arrest, has been hospitalised after his health deteriorated, an advisor said on Friday. Mousavi, the last person to serve as Iran's premier before the post was abolished, had claimed to be the rightful victor of the disputed 2009 presidential elections. Most recently, he urged Iran's clerical leadership …