• Full text available at: DOAJ Directory of Open Access Journals
• Available from 2000.
  
• Full text available at: EBSCOhost Academic Search Complete
• Available from 12/01/2008.
  
• Full text available at: MDPI - Multidisciplinary Digital Publishing Institute
• Available from 2000 volume: 1 issue: 1.
  
• Full text available at: PubMed Central
• Available from 2007 volume: 8.
  
• Full text available at: PubMed Central Open Access
• Available from 2007 volume: 8.
  

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