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.
Cummings KM, Zaki A, Markello S.Cummings KM, et al.Int J Epidemiol. 1991 Mar;20(1):121-5. doi: 10.1093/ije/20.1.121.Int J Epidemiol. 1991.PMID: 2066208
Cummings KM, Markello SJ, Mahoney M, Bhargava AK, McElroy PD, Marshall JR.Cummings KM, et al.Arch Environ Health. 1990 Mar-Apr;45(2):74-9. doi: 10.1080/00039896.1990.9935929.Arch Environ Health. 1990.PMID: 2334235
Michalek AM, Mahoney MC, Cummings KM, Hanley J, Snyder R.Michalek AM, et al. Among authors: cummings km.N Y State J Med. 1989 Oct;89(10):557-61.N Y State J Med. 1989.PMID: 2608215