She just returned home after a 14-month stint in east and central Africa where she helped manage humanitarian efforts for Doctors Without Borders. Anna Mapes is an emergency room nurse at Oregon Health & Science University who just spent six months in Dadaab, Kenya working for Doctors Without Borders. With around 500,000 refugees from neighboring war torn areas there, it is considered the largest refugee camp in the world. Mapes focused on helping the thousands of malnourished children who live there.