The NAO says it is impossible to know how many people were infected each year, and how many died, making it harder to tackle the problem and reduce the numbers.
They then looked at Danish health registers up until the end of 1998 to look at how many of the men and women had cardiovascular problems, and up to 2001 to see how many had died.
Think about the historic diseases we couldn't treat and how many people died because of the lack of antibiotics and advances in medicine.
But an accurate estimate of how many people died may not be available for some time, Imperato says, because it will require tallying up missing people, many of whom were swept away from where they died or out to sea.
The Mail says Health Secretary Jeremy Hunt is to be "warmly congratulated" for imposing a ban on gagging orders used to silence whistle-blowers in the NHS. The paper wonders "how many who died in squalor and misery might have been saved", if insiders had been free to alert the press and public earlier.
It is not yet clear how many sheep have died as a result of the snow.
It is not known how many elephants have died in the recent spate of killings, which are believed to be part of a wider surge in poaching fuelled by growing Asian demand for ivory.
No one is sure how many African-Americans died that day, but some estimates say as many as 90 were killed.
But King said he finds it hard to understand how that many patients could have died at the hospital, even under such grim conditions.
Using global data, Harvard researchers have estimated how many people in each of 187 countries likely died from causes linked to over-consumption of sugary drinks.
FORBES: The Top Countries for Sugary Drink-Related Deaths: U.S. Ranks Third
Libya's new leaders will have to distinguish themselves in many ways, not least how they guarantee the freedom, dignity and justice that so many have fought and died for.
BBC: Libya conflict: Black African migrants caught in backlash
It is difficult to ascertain exactly how many of the 350 U.S. soldiers died in captivity and on the subsequent death march.
CNN: Lawmakers to Army chief: Honor soldiers held as slaves by Nazis
"We do know a lot more about how someone died of a heart attack than just how many people were injured by guns, " Sauaia said.
His fans have said a final goodbye to Michael Jackson, even as many issues following his death have yet to be sorted out, including how he died and where exactly he will be buried.
Looking back to the alcoholic patient who died on my last day as a GP many years ago I can see how it was very difficult for him to keep away from his alcoholic medicine.
Many of our men died, and I tried keeping track of who they were and how they died.
CNN: WW II vet held in Nazi slave camp breaks silence: 'Let it be known'
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