Geographic variations in utilization rates in Veterans Affairs hospitals and clinics.
Ashton CM; Petersen NJ; Souchek J; Menke TJ; Yu HJ; Pietz K; Eigenbrodt ML; Barbour G; Kizer KW; Wray NP; The New England Journal Of Medicine, 1999, vol. 340, issue 1, p 32, ISSN 00284793. ISBN 00284793.
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