Mazyouna, a 13-year-old girl from Gaza, lost the right side of her jaw in an Israeli attack on her home in Gaza that killed her brother and sister. Subscribe to The Guardian on YouTube ► http://bit.ly/subscribegdn She was denied access by Israel to life-altering surgery abroad for more than six months. Only after the publication of a Guardian article condemning her treatment were Mazyouna, her mother and her surviving sibling granted permission to leave - her father was not permitted to join