Correction: Detecting rare diseases in electronic health records using machine learning and knowledge engineering: Case study of acute hepatic porphyria

• Aaron M. Cohen, 
• Steven Chamberlin, 
• Thomas Deloughery, 
• Michelle Nguyen, 
• Steven Bedrick, 
• Stephen Meninger, 
• John J. Ko, 
• Jigar J. Amin, 
• Alex H. Wei, 
• William Hersh