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.
Han AR, Kim HO, Cha SW, Park CW, Kim JY, Yang KM, Song IO, Koong MK, Kang IS.Han AR, et al. Among authors: koong mk.Clin Exp Reprod Med. 2011 Jun;38(2):103-8. doi: 10.5653/cerm.2011.38.2.103. Epub 2011 Jun 30.Clin Exp Reprod Med. 2011.PMID: 22384427Free PMC article.
Koo HS, Bae JY, Kang IS, Koong MK, Kim HO, Cha SH, Choi MH, Kim JY, Yang KM.Koo HS, et al. Among authors: koong mk.Clin Exp Reprod Med. 2011 Jun;38(2):109-14. doi: 10.5653/cerm.2011.38.2.109. Epub 2011 Jun 30.Clin Exp Reprod Med. 2011.PMID: 22384428Free PMC article.
Yoo JH, Cha SH, Park CW, Kim JY, Yang KM, Song IO, Koong MK, Kang IS, Kim HO.Yoo JH, et al. Among authors: koong mk.Clin Exp Reprod Med. 2011 Sep;38(3):159-63. doi: 10.5653/cerm.2011.38.3.159. Epub 2011 Sep 30.Clin Exp Reprod Med. 2011.PMID: 22384436Free PMC article.