PMID: 18308967 [PubMed - indexed for MEDLINE]
N Engl J Med. 1969 Jan 16; 280(3):124-30.
[N Engl J Med. 1969]
Geriatrics. 1971 Oct; 26(10):107-18.
[Geriatrics. 1971]
Zhonghua Nei Ke Za Zhi. 1984 May; 23(5):257-60.
[Zhonghua Nei Ke Za Zhi. 1984]
Can Med Assoc J. 1969 Jun 7; 100(21):992-8.
[Can Med Assoc J. 1969]
J Am Vet Med Assoc. 1983 Oct 1; 183(7):773-80.
[J Am Vet Med Assoc. 1983]
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