def self.source_info
        {
          base_url: 'http://www.clearityfoundation.org/healthcare-pros/drugs-and-biomarkers.aspx',
          citation: 'http://www.clearityfoundation.org/healthcare-pros/drugs-and-biomarkers.aspx',
          site_url: 'https://www.clearityfoundation.org/healthcare-pros/drugs-and-biomarkers.aspx',