PMID: 765517 [PubMed - indexed for MEDLINE]
JAMA. 1981 Jun 12; 245(22):2290.
[JAMA. 1981]
JAMA. 1983 May 27; 249(20):2823.
[JAMA. 1983]
JAMA. 1982 Aug 6; 248(5):589.
[JAMA. 1982]
JAMA. 1981 Dec 4; 246(22):2614.
JAMA. 1979 Mar 9; 241(10):1010.
[JAMA. 1979]
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