My father died from alcohol back in November. He could only go a few hours before showing signs of withdrawal. During the last two days of his life. He tried to sober up but was fainting and falling a lot because his heart was so weak. My brother found him on the bathroom floor, the bathroom sink was still running. We guessed he was getting sick over the sink and stood up too quickly, blacked out, fell, hit the back of his head and died. The official death certificate said cause of death: blunt force trauma to the head. It listed the secondary cause as falling. And that was it. No mention of alcohol whatsoever. This study wouldn't include him. I wonder how much worse the problem really is.