Tadao Maeda1,2,3 and Masayo Takahashi1,2,3 1Research Center, Kobe City Eye Hospital, Kobe 6500-047, Japan 2Department of Ophthalmology, Kobe City Eye Hospital, Kobe 6500-047, Japan 3Vision Care Cell Therapy, Kobe 650-0047, Japan Correspondence: takahashisec{at}vision-care.jp