• Full text available at: Sage Journals Open Access Journals
• Available from 2008 volume: 1.
  
• Full text available at: BioOne Free
• Available from 2008 volume: 1 issue: 1.
  
• Full text available at: DOAJ Directory of Open Access Journals
• Available from 2008.
  
• Full text available at: EBSCOhost Environment Complete
• Available from 01/01/2009.
  
• Full text available at: PubMed Central
• Available from 2008 volume: 1.
  
• Full text available at: PubMed Central Open Access
• Available from 2008 volume: 1.
  

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