[1] Brown Univ, Warren Alpert Med Sch, Med Sch, Providence, RI 02912 USA
[2] Mayo Clin, Radiol, Rochester, MN USA
[3] Mayo Clin, Orthoped Surg, Phoenix, AZ USA
[4] Vanderbilt Univ, Mol & Cellular Biol, Nashville, TN USA
[5] Augusta Hlth, Radiology, Fisherville, KY USA
[6] Brigham & Womens Hosp, Radiol, Boston, MA USA