[1] Thomas Jefferson Univ, Jefferson Med Coll, Wills Eye Hosp, William & Anna Goldberg Glaucoma Serv, Philadelphia, PA 19107 USA
[2] Thomas Jefferson Univ, Jefferson Med Coll, Wills Eye Hosp, Diagnost Lab, Philadelphia, PA 19107 USA
[3] Tulane Med Sch, Tulane Ctr Clin Effectiveness & Prevent, New Orleans, LA USA