Discarded heroin syringes are stuck into a banana tree after they were used by addicts in Hanoi, Vietnam, December 1, 2015. Some of the syringes are re-used by poorer addicts. The estimated number of adolescents dying of AIDS in the Asia Pacific region has more than doubled since 2005, experts said on Monday, warning of a "hidden epidemic". REUTERS/Kham TPX IMAGES OF THE DAY