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Nikolai Michailowitsch Popow (* 30. July 1854 in Kirov; † 31. May 1939 in Sofia) was a psychiatrist. He was 84 years old. His education included S. M. Kirov Military Medical Academy and Imperial Academy of Medical Surgery. He worked at Kazan Federal University, Psychiatric Hospital of St. Nicholas the Wonderworker, Imperial University of Warsaw, Kazan Imperial University and Sofia University.