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The authors investigate in a group of 211 children aged 2 - 6 years , incl . in particular a group of 33 2 - year - old ones , in 1990 and checked in 1991 at two sites in Bratislava - - a town with a varying concentration of NOX , SO2 , dustiness and dust fallout - - their influence on the incidence , type and course of relapsing respiratory disease .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
 None