Dr Rosie Pelham, originally from Kent in England, takes an emergency telephone call at two in the morning at the Medair compound in Renk Town.

Since the end of 2013, conflict has cost almost 400,000 lives and left six million people, of a population of 11 million, desperately hungry. Only 40% of South Sudan's population has access to health care. South Sudan has one of the highest maternal death rates in the world at 789 deaths per 100,000 live births.