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We report three cases of severe hypoxaemia after ibuprofen administration during a randomised controlled trial of prophylactic treatment of patent ductus arteriosus with ibuprofen in premature infants born at less than 28 weeks of gestation .
 Disease: hypoxaemia; Chemical: ibuprofen; Disease: patent ductus arteriosus; Chemical: ibuprofen
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: hypoxaemia; Chemical: ibuprofen; Disease: patent ductus arteriosus; Chemical: ibuprofen