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Emergency Medicine Clinics of North America|November 21, 2020
Headache in the Emergency Department: Avoiding Misdiagnosis of Dangerous Secondary Causes, An UpdateRyan Raam, Ramin R TabatabaiContemporary Clinical Trials|July 6, 2006
The Cost-Time Index: a new method for measuring the efficiencies of recruitment-resources in clinical trialsKen S Ota, Leah Friedman, J Wesson Ashford, et al.Pageof 1