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• 
  Online resource available at: JSTOR Access Initiative
• Available from 03/01/1992 volume: 41 issue: 1.
  Most recent 4 year(s) not available.
  
• 
  Online resource available at: JSTOR Biological Sciences Collection
• Available from 03/01/1992 volume: 41 issue: 1.
  Most recent 4 year(s) not available.
  
• 
  Online resource available at: JSTOR Ecology and Botany I
• Available from 03/01/1992 volume: 41 issue: 1.
  Most recent 4 year(s) not available.
  
• 
  Online resource available at: JSTOR Life Sciences Collection
• Available from 03/01/1992 volume: 41 issue: 1.
  Most recent 4 year(s) not available.
  
• 
  Online resource available at: Academic Search Elite Show license Hide license
• Available from 03/01/1998.
  Most recent 1 year(s) not available.
  
• 
  Online resource available at: EBSCOhost Health Source Nursing Academic Edition
• Available from 03/01/1998.
  Most recent 1 year(s) not available.
  
• 
  Online resource available at: Oxford University Press Journals Current Show license Hide license
• Available from 1996 volume: 45 issue: 1.
  
• Selected full text available at: PubMed Central
• Available from 2009 volume: 58 issue: 1.
  Most recent 1 year(s) not available.
  
• 
  Online resource available at: Oxford Near Archive Journals
• Available from 1996 until 2014.
  

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