Ndt_a_219244 3351..3357

1Department of Paediatric Surgery, Qingdao Women and Children’s Hospital, Qingdao, People’s Republic of China; 2Department of Obstetrics, The Affiliated Central Hospital of Qingdao University, Qingdao, People’s Republic of China; 3Department of Child Health Care, Huangdao Maternity and Child Health Care Hospital of Qingdao, Qingdao, People’s Republic of China; 4Department of Environmental Health, Qingdao Centers for Disease Control and Prevention/Qingdao Institute for Preventive Medicine, Qingdao, People’s Republic of China; 5School of Food Science and Engineering, South China University of Technology, Guangzhou 510640, People’s Republic of China; 6Biomedical Research Center, Northwest Minzu University, Lanzhou 730030, People’s Republic of China; 7College of Veterinary Medicine, South China Agricultural University, Guangzhou, 51062, People’s Republic of China