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Abaraogu, Ukachukwu Okoroafor; Tabansi-Ochuogu, Chidinma Samantha; Igwe, Sylvester Emeka . (2016). TENS and heat therapy for pain relief and quality of life improvement in individuals with primary dysmenorrhea: A systematic review. Complementary Therapies in Clinical Practice, (), S1744388116300329–. doi:10.1016/j.ctcp.2016.05.001 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research