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• Full text available at: SpringerOpen Free
• Available from 2000 volume: 1 issue: 1.
  
• Full text available at: PubMed Central
• Available from 2000 volume: 1 until 2019 volume: 20.
  
• Full text available at: PubMed Central Open Access
• Available from 2000 volume: 1 until 2019 volume: 20.
  
• Full text available at: BioMed Central Open Access Free
• Available from 2000.
  
• Full text available at: DOAJ Directory of Open Access Journals
• Available from 2000.
  

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