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1 A comparative study on the obstetric services utilization by income classes among the National Health Insurance Beneficiaries
Kyung Ha Kim, Rah Il Hwang, Ji Won Yoon, Ki-Jin Ryu, Soon-Cheol Hong
Korean J Obstet Gynecol.2012;55(11):804-813.   Published online 2012 November 16     DOI: http://dx.doi.org/10.5468/KJOG.2012.55.11.804
      

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