bone age
...that bone age is usually determined by examining x-rays of the long bones?
...that <b id="mwApI"><a href="./Bone_age" id="mwApM" rel="mw:WikiLink" title="Bone age">bone age</a></b> is usually determined by examining <a href="./X-ray" id="mwApQ" rel="mw:WikiLink" title="X-ray">x-rays</a> of the <a href="./Long_bone" id="mwApU" rel="mw:WikiLink" title="Long bone">long bones</a>?