Department of Radiology;
Longgang Central Hospital of Shenzhen City;
Shenzhen 518116;
Guangdong Province;
China;
Department of Radiology;
First Affiliated Hospital of Kunming University;
Kunming 650031;
Yunnan Province;
China;
Shenzhen Maternal and Child Health Center;
Shenzhen 518025;
Guangdong Province;
China;