This picture taken early on August 4, 2019 shows Nok (C), a volunteer medic, reacting after tear gas was fired by police during a protest in the Wong Tai Sin area of Hong Kong's Kowloon district. - Nurses, doctors, medical students and ordinary people with first aid training have all clamoured to join what has become a small volunteer corps helping treat people on the frontlines of protests that have engulfed the city for over two months. (Photo by ANTHONY WALLACE / AFP) / TO GO WITH HongKong-politics-unrest-China-health,FOCUS by Yan Zhao (Photo credit should read ANTHONY WALLACE/AFP/Getty Images)
