CAIRO/GAZA: Fourteen-year-old Mohammed Wael Helles has been waiting for surgery on a serious spinal injury caused by an Israeli airstrike for nearly two months, one of thousands of Gazans waiting for urgent treatment in Gaza’s battered health system. Helles was a top student with aspirations of becoming a doctor when he was wounded weeks before a ceasefire that paused two years of warfare. The attack, which killed the driver of his vehicle, tore his spinal cord and fractured three vertebrae.