1. Medical Genetic Center, Maternal and Child Health Hospital of Shaoguan, Shaoguan, Guangdong 512026, P.R. China
2. Department of Infection Control, Guangzhou Hospital of Traditional Chinese Medicine, Guangzhou, Guangdong 510130, P.R. China
3. Department of Breast Surgery, Maternal and Child Health Hospital of Shaoguan, Shaoguan, Guangdong 512026, P.R. China
4. Department of Gynecology, Maternal and Child Health Hospital of Shaoguan, Shaoguan, Guangdong 512026, P.R. China