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PII: S0897-1897(06)00133-9
doi:10.1016/j.apnr.2006.10.003
© 2007 Published by Elsevier Inc.
PII: S0897-1897(06)00133-9
doi:10.1016/j.apnr.2006.10.003
© 2007 Published by Elsevier Inc.