quality

It means the decline you would normally expect in one year would take four years after treatment, giving patients decades of "good quality life", Prof Sarah Tabrizi told BBC News.

That said, there are ways to evaluate the quality of surveys and determine which are best consumed with a healthy shaker of salt and which should be dismissed altogether.

Playing a year up for Cardiff Blues under-15 girls team, her quality still stood out.

Keller said her husband was long aware of the issue, but it had now degraded the quality of their lives to the point that he was spurred to act.

"We are leaving behind quality people, our home, and all our possessions."