Switching to Gatekeeping: Changes in Expenditures and Utilization for Children.
Manganello, Jennifer A.; Chang, Yuchiao; Causino, Nancyanne; Blumenthal, David; Ferris, Timothy G. G.; Perrin, James M.; Pediatrics, 2001, vol. 108, issue 2, p 283, ISSN 00314005. ISBN 00314005.

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