Melinda Gates, Co-chair of the Bill & Melinda Gates Foundation, listens to a question during a news conference before her address to the 67th World Health Assembly at the United Nations European headquarters in Geneva May 20, 2014. The World Health Assembly, which is the annual meeting of the WHO's 194 Member States and is its highest decision-making body, takes place from May 19 to 27. REUTERS/Denis Balibouse (SWITZERLAND - Tags: POLITICS HEALTH HEADSHOT)