[1] Moorfields Eye Hosp, Dept Ophthalmol, Anterior Segment Serv, 51 North Block, London SE1 7PJ, England
[2] Hosp Clin Univ Valladolid, Serv Oftalmol, Unidad Tumores Intraoculares Adulto, Valladolid, Spain
[3] Hospial Clin Univ Valladolid, Unidad Patol, Valladolid, Spain