1079
However , one trial analysed subgroups of 2839 relatively healthy 50 to 59 year - old women taking combined continuous HT and 1637 taking oestrogen - only HT , versus similar - sized placebo groups .
 Chemical: oestrogen
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:
 Chemical: oestrogen