Dr. Keiji Kuroda is a specialist in reproductive medicine and endoscopic surgery. He is a division manager of intractable infertility and endoscopy, Sugiyama Clinic Shinjuku, Tokyo and a part-time associate professor at Juntendo University, Tokyo. He had researched oocyte activation at Tokyo Women’s Medical University, from 2004 to 2005 and the function of decidualization of human endometrium in Imperial College London and University of Warwick, UK, from 2010 to 2012. His current research interests include endometrial function during implantation and early pregnancy, repeated implantation failure, and recurrent pregnancy loss.