[1] Univ Klinikum Freiburg, Klin Augenheilkunde, Killianstr 5, D-79106 Freiburg, Germany
[2] Albert Ludwigs Univ Freiburg, Med Fak, Freiburg, Germany
[3] Stanford Univ, Byers Eye Inst, Sch Med, Palo Alto, CA USA
[4] Augenzentrum St Franziskus Hosp, Ophtha Lab, Munster, Germany