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.
Cheung YB, Ng GY, Wong LC, Koo WH, Tan EH, Tay MH, Lim D, Poon D, Goh C, Tan SB.Cheung YB, et al. Among authors: koo wh.Ann Acad Med Singap. 2003 May;32(3):376-80.Ann Acad Med Singap. 2003.PMID: 12854381
Teo M, Foo KF, Koo WH, Wong LT, Soo KC.Teo M, et al. Among authors: koo wh.World J Surg. 2006 Dec;30(12):2132-5. doi: 10.1007/s00268-005-0474-2.World J Surg. 2006.PMID: 17006612