Premise: Nil Fyodorovich Filatov (Russian: Нил Фёдорович Филатов , 2 June [O.S. 21 May] 1847 , or 16 April [O.S. 4 April] 1847 , – 8 February [O.S. 26 January] 1902 ) was a physician who is considered the founder of Russian paediatrics. His nephew Vladimir Filatov was a prominent ophthalmologist.
Hypothesis: Nil Fyodorovich FIlatov was still practing medicine when he died.