 |
JAMA - Journal of the American Medical Association
http://jama.ama-assn.org/ |
103 |
|
|
CDC - MMWR publications
http://www.cdc.gov/mmwr/ |
133 |
|
|
New England Journal of Medicine
http://www.nejm.org/JHome.htm |
128 |
|
|
The British Medical Journal
http://www.bmj.com/bmj/ |
109 |
|
|
The Lancet
http://www.thelancet.com/ |
181 |
|
|
Nature
http://www.nature.com/ |
199 |
|
|
Science
http://www.sciencemag.org/ |
104 |
