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Fraser, Felicia; Matsuzawa, Yuka; Lee, Yuen Shan Christine; Minen, Mia . (2017). Behavioral Treatments for Post-Traumatic Headache. Current Pain and Headache Reports, 21(5), 22–. doi:10.1007/s11916-017-0624-x 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research