Stephen Sackur speaks with Joanne Liu, International President of Médecins Sans Frontières, Doctors without Borders. In early October American forces in Afghanistan fired missiles into a Kunduz hospital killing 22, including 12 staff working for MSF. The organisation demanded that the incident be investigated as a war crime. But in the world’s most dangerous conflict zones, is it possible to save lives and not take sides?(Photo credit: BBC News)