1 Department of Neonatology, Foshan Chancheng Central Hospital, Foshan, Guangdong, China.
2 Department of Neonatology, Guangdong Women and Children Hospital, Guangzhou Medical University, Guangzhou, Guangdong, China.
3 Department of Neonatology, Guangdong Women and Children Hospital, Guangzhou Medical University, Guangzhou, Guangdong, China. Electronic address: renzhx1990@163.com.