environmental factor
Bunn, D., Jimoh, F., Wilsher, S. H., Hooper, L. 2015. Increasing fluid intake and reducing dehydration risk in older people living in long-term care: A systematic review. Journal of the American Medical Directors Association. 16 (2) 101-113.
Fletcher, P. C., Hirdes, J. P. 2002. Risk factors for falling among community-based seniors using home care services. Journals of Gerontology Series A Biological Sciences & Medical Sciences. 57 (8) M504-M510.