1. Department of Pediatrics, The Affiliated Hospital of Qingdao University, Qingdao, China;
2. Department of Nursing, Medical College of Qingdao University, Qingdao, China;
3. Prenatal Diagnosis Center, The Affiliated Hospital of Qingdao University, Qingdao, China;
4. Genetic Laboratory, The Affiliated Hospital of Qingdao University, Qingdao, China;
5. Child Health Care Department, The Affiliated Hospital of Qingdao University, Qingdao, China