• Full text available at: EBSCOhost Academic Search Complete
• Available from 12/01/2008 until 01/01/2015.
  
• Full text available at: PubMed Central
• Available from 2008 volume: 1 until 2015 volume: 8.
  
• Full text available at: PubMed Central Open Access
• Available from 2008 volume: 1 until 2015 volume: 8.
  

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