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.
Ayati Z, Yang G, Ayati MH, Emami SA, Chang D.Ayati Z, et al. Among authors: chang d.BMC Complement Med Ther. 2020 Nov 9;20(1):333. doi: 10.1186/s12906-020-03102-3.BMC Complement Med Ther. 2020.PMID: 33167948Free PMC article.
Yang G, Li W, Cao H, Klupp N, Liu J, Bensoussan A, Kiat H, Chang D.Yang G, et al. Among authors: chang d.BMJ Open. 2017 Aug 18;7(8):e014507. doi: 10.1136/bmjopen-2016-014507.BMJ Open. 2017.PMID: 28821509Free PMC article.