An official website of the United States government
The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before
sharing sensitive information, make sure you’re on a federal
government site.
The site is secure.
The https:// ensures that you are connecting to the
official website and that any information you provide is encrypted
and transmitted securely.
Huang WJ, Cheng BL, Hu SK, Chu C.Huang WJ, et al. Among authors: cheng bl.J Environ Sci Health A Tox Hazard Subst Environ Eng. 2006;41(8):1587-605. doi: 10.1080/10934520600754128.J Environ Sci Health A Tox Hazard Subst Environ Eng. 2006.PMID: 16835113
Cheng BL, Xu D, Ye B, Tang LF, Chen ZM.Cheng BL, et al.Zhonghua Er Ke Za Zhi. 2021 Jun 2;59(6):519-521. doi: 10.3760/cma.j.cn112140-20201111-01023.Zhonghua Er Ke Za Zhi. 2021.PMID: 34102829Chinese.