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07192418 ©YAHYA ARHAB/EPA/MAXPPP -SANA'A 20181127 Yemeni women wait to get their children vaccinated during an anti-polio vaccination campaign at a health center in Sana'a, Yemen, 27 November 2018. According to reports, the United Nations Children's Fund (UNICEF), World Health Organization (WHO) and local health authorities in the war-affected Yemen have launched a three-day polio vaccination campaign, aiming at reaching 5.5 million children under the age of five.