1. From the Department of Pathology, Shandong University QiLu Hospital, Jinan, China (Drs Hu and Han); the Key Laboratory of Experimental Teratology, Ministry of Education and Department of Pathology, Shandong University, School of Basic Medical Sciences, Jinan, China (Dr Han); and the Department of Pathology, Duke University School of Medicine, Durham, North Carolina (Dr Huang).