BWAHAHAHAHAHAHA!!!!!!!!!!!!!!!!!!!!!!!
This is sheer nonsense, and either represents faulty statistical techniques or is an example of misreporting. The authors are utterly unable to pinpoint even a single death in the Unitd States as resulting from the Fukushima meltdown.
Why? Because there weere none.
If researchers went through ALL the death certificates issued in the United States for the 14 weeks subsequent to the Fukushima incident, they would not find even one listing radiation poisoning from Fukushima as the cause of death.
What we have here is an example of the snowball fallacy. If 10,000,000 snowballs thrown at one person would result in one death, then 10,000,000 snowballs thrown at 10,000,000 people will also result in one death. This kind of thing makes a joke of statistics.