For nearly 40 years Afghanistan has been in a constant state of war. How has this affected the mental health of its people? Sahar Zand reports.

For nearly 40 years Afghanistan has been in a constant state of war. How has this affected the mental health of its people? With unprecedented access to Afghanistan's only secure mental health unit, Sahar Zand meets patients, including a former Taliban fighter, struggling to deal with the trauma of war.