A malnourished child is seen at a therapeutic feeding centre at al-Sabyeen hospital in Sanaa April 15, 2013. The United Nations Children's Fund, UNICEF, has said that 57 percent of Yemen's 12 million children are chronically malnourished - the highest level of chronic malnutrition in the world after Afghanistan. REUTERS/Mohammed al-Sayaghi (YEMEN - Tags: HEALTH)