The 4 early warning signs of cardiac arrest and how defibrillators save lives, as Christian Eriksen collapses mid-match

DANISH football star Christian Eriksen collapsed midway through a friendly with Ukraine, clutching his chest and falling to the turf before cameras panned away. Players huddled around the 34-year-old, who was briefly unconscious before recovering and being able to walk off the pitch. He's since been taken to hospital, where he's undergoing further testing to...