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British psychiatrist and writer Dr Raj Persaud, pictured at the Edinburgh International Book Festival where he talked about his work. The book festival is the world's largest literary event and features writers from around the world. The 2007 event featured around 550 writers and ran from 11-27 August. (Photo by Colin McPherson/Corbis via Getty Images)

British psychiatrist and writer Dr Raj Persaud, pictured at the Edinburgh International Book Festival where he talked about his work. The book festival is the world's largest literary event and features writers from around the world. The 2007 event featured around 550 writers and ran from 11-27 August. (Photo by Colin McPherson/Corbis via Getty Images)