4044
We used intersubject image registration to integrate 3D hip CT images into a statistical atlas comprising women aged 21 to 97 years ( n = 349 ) and a group of women with ( n = 74 ) and without ( n = 148 ) incident hip fracture 4 to 7 years after their imaging session .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
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