Hanratty B, Stow D.  Changes over time in the health and functioning of older people moving into care homes: Analysis of data from the English Longitudinal Study of Ageing.  Age and Ageing 2017, 46(4), 693-696.  https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5590718/pdf/emss-73563.pdf  doi:10.1093/ageing/afx046