PMID: 379381 [PubMed - indexed for MEDLINE]
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[J Neurol Neurosurg Psychiatry. 2001]
JAMA. 1984 Jul 13; 252(2):257.
[JAMA. 1984]
JAMA. 1982 Oct 1; 248(13):1641.
[JAMA. 1982]
JAMA. 1979 Jun 8; 241(23):2511.
[JAMA. 1979]
Med Phys. 1995 Nov; 22(11 Pt 2):1869-75.
[Med Phys. 1995]
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