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Rerkasem, K.. (2006). Prognostic Factors of Leg Amputation in Patients With Vascular Injury: A Systematic Review. The International Journal of Lower Extremity Wounds, 5(2), 78–82. doi:10.1177/1534734606287322 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research