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He was also an active chamber music performer of the highest level , as he was the first violin of the Zagreb String Quartet from 1936-38 and was a member of the Maček - Šulek - Janigro Trio from 1939-45 .
 Zagreb, Maček, Šulek, Janigro
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Zagreb, Maček, Šulek, Janigro