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  Online resource available at: SAGE Complete Deep Backfile Purchase 2009
• Available from 01/01/1941 volume: 1 issue: 1 until 12/31/1998 volume: 58 issue: 6.
  
• 
  Online resource available at: Sage Journals All Titles
• Available from 01/01/1941 volume: 1 issue: 1.
  
• Selected full text available at: PubMed Central Open Access

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