304884
It joined with Kluwer in the 1990s as Kluwer/Reidel , together being purchased by Cinven and Candover in 2003 .
 Kluwer, Cinven, Candover
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Kluwer, Cinven, Candover