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[Comment] Re-engaging the health community around peace

The wars and violence in the Middle East and north Africa, together with tragic scenes of refugees seeking safety in Europe, offer the starkest of reminders that good health is incompatible with war and conflict. Apart from their direct physical and psychological effects, wars and conflict damage health-care, food, water, and sanitation systems; pollute and degrade the environment; and undermine development.1 The effect of violence on the global economy in 2014 cost about US$14·3 trillion, equivalent to a hundred times the total official development assistance from rich to poor countries.