A highly collimated beam of protons (<InlineEquation ID="Equ1"> <EquationSource Format="TEX">$\approx$</EquationSource> </InlineEquation>1 MeV) entering the channel of a monocrystal film forms at a certain depth an extremely sharp (0.005 nm) and relatively long (some monolayers of the crystal) focusing area where the increase of the flux density can reach thousand times. Impinging...</equationsource></inlineequation>

Within policy and practice there is an increasing interest in the care of frail elders. However understanding of the experience and challenges of living and dying with frailty in older age is currently undeveloped. Frailty is often used as a synonym for the increasing infirmities that accompany...