• September 2019. Retrieved 13 September 2019. Wilfredo Gutiérrez (2011). "Poliomielitis paralítica causada por la vacuna oral sabin ¿tiempo de cambiar de vacuna...
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  • continued in the male line. Since early childhood, Kobozev was ill with poliomielitis. Since the 1920s, he had had a number of serious diseases, including...
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