1. Medical Genetics Center, Guangdong Women and Children Hospital, Guangzhou, P.R. China.
2. Maternal and Children Metabolic-Genetic Disease Key Laboratory of Guangdong Women and Children Hospital, Guangzhou, P.R. China.
3. Health Care Institute, Guangdong Women and Children Hospital, Guangzhou, P.R. China.
4. Reproductive Center, Guangdong Women and Children Hospital, Guangzhou, P.R. China.