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SANAA, YEMEN - MAY 19: A cholera affected woman is seen on a stretcher as she receives a medical treatment at the Al Sabeen Maternal Hospital in Sanaa, Yemen on May 19, 2019. Yemen has been beset by violence and chaos since 2014, when Houthi rebels overran much of the country, including the capital, Sanaa. The crisis escalated in 2015 when a Saudi-led military coalition launched a devastating air campaign aimed at rolling back Houthi territorial gains. Since then, tens of thousands of Yemenis, including civilians, are believed to have been killed in the conflict while another 14 million are at risk of starvation, according to the UN. Yemen is facing one of the worlds worst humanitarian crises, with more than 10 million people driven to the brink of famine. More than 22 million people in Yemen are desperate for humanitarian aid and protection. (Photo by Mohammed Hamoud/Anadolu Agency/Getty Images)

SANAA, YEMEN - MAY 19: A cholera affected woman is seen on a stretcher as she receives a medical treatment at the Al Sabeen Maternal Hospital in Sanaa, Yemen on May 19, 2019. Yemen has been beset by violence and chaos since 2014, when Houthi rebels overran much of the country, including the capital, Sanaa. The crisis escalated in 2015 when a Saudi-led military coalition launched a devastating air campaign aimed at rolling back Houthi territorial gains. Since then, tens of thousands of Yemenis, including civilians, are believed to have been killed in the conflict while another 14 million are at risk of starvation, according to the UN. Yemen is facing one of the worlds worst humanitarian crises, with more than 10 million people driven to the brink of famine. More than 22 million people in Yemen are desperate for humanitarian aid and protection. (Photo by Mohammed Hamoud/Anadolu Agency/Getty Images)