1. Liaoning Centre for Prenatal Diagnosis; Department of Gynecology & Obstetrics; Shengjing Hospital affiliated to China Medical University; Shenyang 110004 China
2. Genetics Unit; Shenyang Women's and Children's Hospital; Shenyang 110004 China
3. Department of Dermatology; the First Affiliated Hospital of China Medical University; Shenyang 110001 China
4. Department of Pediatrics; the First Affiliated Hospital of China Medical University; Shenyang 110001 China