3981
A 28-year follow-up of 740 World War II veterans whose spleens were removed on the battlefield showed a significant increase in the usual death rate from pneumonia ( 6 rather than the expected 1.3 ) and an increase in the death rate from ischemic heart disease ( 41 rather than the expected 30 ) , but not from other conditions .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 None