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In 2008 , vascular surgeon Paolo Zamboni suggested that MS involves a vascular process he referred to as chronic cerebrospinal venous insufficiency ( CCSVI ) , in which veins from the brain are constricted .
 Paolo Zamboni
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Paolo Zamboni