COPENHAGEN—Denmark’s team doctor said Sunday that Christian Eriksen’s heart stopped and that “he was gone” before being resuscitated with a defibrillator at the European Championship. Eriksen collapsed during Denmark’s opening Euro 2020 group game against Finland on Saturday and was given lengthy medical treatment before regaining consciousness. “He was gone. And we did cardiac resuscitation. And it was cardiac arrest,” said team doctor Morten Boesen, who led the work in giving Eriksen treatment on the field. “How close were we? I don’t know. We got him back after one defib. That’s quite fast.” Eriksen was in stable condition at a Copenhagen hospital and had spoken to teammates via video link on Sunday, team officials said. Boesen said it was still unclear what caused the midfielder’s collapse. “I’m not cardiologist, so the details about why it happened and further, I will leave to the experts,” he said. He also said the …