• Full text available at: DOAJ Directory of Open Access Journals
• Available from 2011.
  
• Full text available at: PubMed Central
• Available from 2011 volume: 1.
  
• Full text available at: PubMed Central Open Access
• Available from 2011 volume: 1.
  
• Selected full text available at: PubMed Central Open Access
• Full text available at: Scholars Portal Journals: Open Access
• Available from 11/01/2011 volume: 1 until 01/31/2024 volume: 14.
  

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