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Fisher, C. M.; Cummings, C. A. . (2016). Assessing Teacher Confidence and Proficiency With Sexuality Education Standards: Implication for Professional Development. Pedagogy in Health Promotion, 2(2), 101–107. doi:10.1177/2373379915618216 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research