Takahito Wada1, Shuichi Suzuki2, Norifumi Shioda3. 1. Department of Medical Ethics and Medical Genetics, Kyoto University Graduate School of Medicine, Kyoto, Japan. 2. Department of Pediatrics, Fukuoka Children's Hospital, Fukuoka, Japan. 3. Institute of Molecular Embryology and Genetics, Kumamoto University, Kumamoto, Japan.