Sands, L. P.; Yaffe, K.; Lui, L.-Y.; Stewart, A.; Eng, C.; Covinsky, K. (2002-07-01). "The Effects of Acute Illness on ADL Decline Over 1 Year in Frail Older Adults With and Without Cognitive Impairment". The Journals of Gerontology Series A: Biological Sciences and Medical Sciences. 57 (7): M449–M454. doi:10.1093/gerona/57.7.m449. ISSN1079-5006. PMID12084807.
Sands, L. P.; Yaffe, K.; Lui, L.-Y.; Stewart, A.; Eng, C.; Covinsky, K. (2002-07-01). "The Effects of Acute Illness on ADL Decline Over 1 Year in Frail Older Adults With and Without Cognitive Impairment". The Journals of Gerontology Series A: Biological Sciences and Medical Sciences. 57 (7): M449–M454. doi:10.1093/gerona/57.7.m449. ISSN1079-5006. PMID12084807.
Sands, L. P.; Yaffe, K.; Lui, L.-Y.; Stewart, A.; Eng, C.; Covinsky, K. (2002-07-01). "The Effects of Acute Illness on ADL Decline Over 1 Year in Frail Older Adults With and Without Cognitive Impairment". The Journals of Gerontology Series A: Biological Sciences and Medical Sciences. 57 (7): M449–M454. doi:10.1093/gerona/57.7.m449. ISSN1079-5006. PMID12084807.