1. National Institute of Neurological Disorders and Stroke common data element project - Approach and methods;Grinnon;Clin Trials,2012
2. Brin M Charles A Aurora S Developing common data elements (CDEs) for headache clinical research: A National Institute of Neurological Disorders and Stroke (NINDS), NIH initiative
3. NINDS Headache CDE Data Standards webpage https://www.commondataelements.ninds.nih.gov/Headache.aspx#tab=Data_Standards.
4. Highlight Summary document https://www.commondataelements.ninds.nih.gov/Doc/Headache/Headache_CDE_Highlight_Summary.pdf
5. Start-Up Resource document https://www.commondataelements.ninds.nih.gov/Doc/Headache/CDEStartupResource_Headache.pdf