[1] Columbia Univ, Coll Phys & Surg, New York, NY 10032 USA
[2] Columbia Univ, Coll Phys & Surg, Dept Dermatol, New York, NY 10032 USA
[3] Columbia Univ, Coll Phys & Surg, Dept Radiol, New York, NY 10032 USA
[4] Columbia Univ, Coll Phys & Surg, Dept Neurol Surg, New York, NY 10032 USA