Schaafsma Frederieke G, Kurrle Susan E, Quine Susan, Lockwood Keri, Cameron Ian D
Rehabilitation Studies Unit, Sydney Medical School, University of Sydney, PO Box 6, Ryde, NSW 1680, Australia.
Age Ageing. 2012 Jan;41(1):121-5. doi: 10.1093/ageing/afr123. Epub 2011 Sep 6.