357793
Tumor On Visor om Slutet , he shared vocal duties with Tapio Wilska and after the album he quit singing entirely , this was because he developed a tumor in his vocal folds and had to retire from vocal duties .
 Tapio Wilska
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Tapio Wilska