• Full text available at: JSTOR Health & General Sciences
• Available from 1915 volume: 1 issue: 1 until 2015 volume: 112 issue: 52.
  
• Full text available at: JSTOR Life Sciences Collection
• Available from 1915 volume: 1 issue: 1.
  Most recent 3 year(s) not available.
  
• Full text available at: Highwire Press Free
• Available from 1915 volume: 1 issue: 1.
  Most recent 6 month(s) not available.
  
• Full text available at: PubMed Central
• Available from 1915 volume: 1.
  Most recent 6 month(s) not available.
  

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