[1] Schon Klin Hamburg Eilbek, Hamburg, Germany
[2] Univ Florence, Meyer Childrens Hosp, Florence, Italy
[3] Moorfields Eye Hosp, London, England
[4] Great Ormond St Hosp Sick Children, NHS Fdn Trust, London, England
[5] Univ Barcelona, Hosp St Joan de Deu, Barcelona, Spain
[6] Univ Med Ctr Utrecht, Utrecht, Netherlands
[7] Barraquer Eye Hosp, Dubai, U Arab Emirates
[8] Cincinnati Childrens Hosp Med Ctr, Cincinnati, OH 45229 USA
[9] Univ Cincinnati, Cincinnati, OH USA
[10] St Franziskus Hosp, Munster, Germany
[11] Univ Duisburg Essen, Essen, Germany
[12] Ist Sci San Raffaele, Milan, Italy
[13] Rigshosp, Copenhagen, Denmark
[14] Kantonsspital Winterthur, Winterthur, Switzerland
[15] Univ Klinikum Hamburg Eppendorf, Augenklin, Hamburg, Germany
[16] Univ Calif Los Angeles, Los Angeles, CA USA
[17] Univ Washington, Seattle, WA USA
[18] Univ Florence, Florence, Italy