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'WAT IS HS?' KAARTEN

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**WARNING**
The videos below are graphic in nature and
represent actual deroofing procedures. 
Deroofing Video from Steven Daveluy, M.D.
Deroofing of Sinus Tracts Video from Cardiff University
Punch Deroofing Procedure from Penn State - Dr. Joslyn Kirby  

*1.5 speed