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Zouboulis, Christos C.; del Marmol, Veronique; Mrowietz, Ulrich; Prens, Errol P.; Tzellos, Thrasivoulos; Jemec, Gregor B.E. . (2015). Hidradenitis Suppurativa/Acne Inversa: Criteria for Diagnosis, Severity Assessment, Classification and Disease Evaluation. Dermatology, 231(2), 184–190. doi:10.1159/000431175 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research