• Full text available at: Health & Medical Collection
• Available from 01/05/2015 volume: 128 issue: 1.
  
• Full text available at: ProQuest Central
• Available from 01/05/2015 volume: 128 issue: 1.
  
• Full text available at: Publicly Available Content Database
• Available from 01/05/2015 volume: 128 issue: 1.
  
• Full text available at: DOAJ Directory of Open Access Journals
• Available from 2000.
  
• Full text available at: Free E- Journals
• Available from 1887.
  
• Full text available at: Journals@Ovid Open Access Journal Collection Rolling
• Available from 01/01/2006 volume: 119 issue: 1.
  
• Full text available at: PubMed Central
• Available from 2015 volume: 128 issue: 1.
  
• Selected full text available at: PubMed Central Open Access
• Full text available at: Scholars Portal Journals: Open Access
• Available from 01/01/2015 volume: 128 issue: 1 until 04/30/2025 volume: 138 issue: 8.
  

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