109900
In adults , degenerative changes to the pubic symphysis , the auricular surface of the ilium , the sternal end of the 4th rib , and dental attrition are commonly used to estimate skeletal age .
 pubic symphysis
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
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Text: {0} 
Answer:
 pubic symphysis