▁after ▁leaving ▁Columbia ▁and ▁also ▁became ▁involved ▁in ▁" to b acco ▁research , ▁labor atory ▁science … [ and ] ▁other ▁major ▁prevent ative ▁research ." ▁In ▁addition , ▁the ▁effic acy ▁of ▁Hudson ' s ▁treatment ▁for ▁what ▁he ▁de emed ▁" ear ly " ▁can cers ▁using ▁methods ▁such ▁as ▁radical ▁surg ery , ▁cas tr ation , ▁and ▁di eth yl st il best rol ▁ther apy ▁was ▁still ▁unknown ▁at ▁that ▁time . ▁However , ▁despite ▁this , ▁Hudson ' s ▁studies ▁were ▁still ▁c ited ▁in ▁many ▁u ro log ical ▁journ als ▁and ▁text books ▁in ▁the ▁late ▁ 1 9 5 0 s ▁and ▁ 6 0 s ▁as ▁a ▁new ▁way ▁to ▁inspect ▁the ▁pro state . ▁Only ▁in ▁a ▁comment ▁by ▁the ▁National ▁Instit utes ▁of ▁Health ▁in ▁a ▁response ▁to ▁one ▁of ▁Hudson ' s ▁requests ▁for ▁fund ing ▁do ▁they ▁consider ▁mal p ract ice , ▁asking ▁for ▁documentation ▁of ▁his ▁comp liance ▁Public ▁Health ▁Service ▁policy . ▁Hudson ▁has ▁pract iced ▁in ▁South ▁Pas ad ena , ▁Florida , ▁Columbia ▁University , ▁New ▁York ▁City , ▁and ▁the ▁Francis ▁Del af ield ▁Hospital , ▁in ▁New ▁York ▁City . ▁Hudson ▁died ▁in ▁ 2 0 1 7 ▁at ▁age ▁ 9 9 . ▁ ▁Con sequ ences ▁ ▁The ▁ult imate ▁goal ▁of ▁Hudson ' s ▁research ▁included ▁finding ▁a ▁vi able ▁way ▁to ▁use ▁open ▁per ine al ▁bi ops y ▁( OP B ) ▁to ▁diagn ose ▁pro