[1] Mayo Clin, Phoenix, AZ 85054 USA
[2] Allegheny Gen Hosp, Pittsburgh, PA 15212 USA
[3] Brigham & Womens Hosp, Boston, MA 02115 USA
[4] Florida Hosp, Orlando, FL USA
[5] Univ Iowa, Ctr Hlth, Iowa City, IA USA
[6] Hosp Univ Penn, Philadelphia, PA 19104 USA
[7] Penn State Milton S Hershey Med Ctr, Hershey, PA USA
[8] Amer Acad Orthopaed Surg, Rosemont, IL USA
[9] Mt Sinai Sch Med, New York, NY USA
[10] Amer Assoc Neurol Surg, Rolling Meadows, IL USA
[11] Congress Neurol Surg, Schaumburg, IL USA
[12] Univ Calif Los Angeles, Med Ctr, Los Angeles, CA 90024 USA
[13] Univ Michigan, Med Ctr, Ann Arbor, MI USA
[14] Winthrop Univ Hosp, Mineola, NY 11501 USA
[15] Thomas Jefferson Univ Hosp, Philadelphia, PA 19107 USA
[16] Emory Univ, Atlanta, GA 30322 USA
[17] Univ Maryland, Sch Med, Baltimore, MD 21201 USA
[18] Hosp Joint Dis & Med Ctr, New York, NY USA
[19] Univ Calif Los Angeles, David Geffen Sch Med, Los Angeles, CA 90095 USA
[20] Univ Arizona, Hlth Sci Ctr, Tucson, AZ USA
[21] Univ Arkansas Med Sci, Little Rock, AR 72205 USA
[22] Blanchard Valley Reg Canc Ctr, Findlay, OH USA