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METHODS : We retrospectively reviewed the medical records and cranial sonograms obtained during a 1 - year period on 122 premature ( < 36 weeks of gestation ) infants .
 Disease: premature ( < 36 weeks of gestation ) infants
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Disease: premature ( < 36 weeks of gestation ) infants