1. Department of Pharmaceutical Analysis; Xuzhou Medical College; Xuzhou 221044 China
2. Jiangsu Key Lab for the study of New Drug and Clinical Pharmacy; Xuzhou Medical College; Yunlong China
3. NUS Environmental Research Inst.; National University of Singapore; 5 A Engineering Srive 1 Singapore 117411 Singapore
4. Saw Swee Hock School of Public Health; National University of Singapore; 16 Medical Drive Singapore 117597 Singapore