(Smithsonian) – Last year, more than 1 million refugees—predominantly from Syria, Afghanistan and Iraq—made the journey to Europe by sea. A third of those were children. For mental health professionals, these young refugees bring unique challenges. Fleeing conflict and war undoubtedly takes a deep psychological toll, but in the midst of an ongoing crisis, no one has yet assessed the full extent of what that toll is. And without a better understanding, physicians are struggling to treat this vulnerable population.