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Measured by the number of murders, Mexico is the most dangerous country in the world to be a journalist. Eight were killed last year and countless more suffered threats, intimidation and violence. Stephen Sackur speaks to Lydia Cacho - one of Mexico’s most prominent journalists, who - after decades of assaults, death threats and at least one assassination attempt - is currently in exile for her own safety. Her particular focus is the violence done to women in Mexico and the failure of those in power to make good on promises of protection. Can courage overcome injustice?