1 Semel Institute for Neuroscience and Human Behavior, Center for Community Health, University of California, Los Angeles, CA, USA. Electronic address: lililili@ucla.edu.
2 Semel Institute for Neuroscience and Human Behavior, Center for Community Health, University of California, Los Angeles, CA, USA.
3 National Institute of Hygiene and Epidemiology, Hanoi, Viet Nam.