Official websites use .gov A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
Periodical. Varmus, Harold, Richard Klausner, Elias Zerhouni, Tara Acharya, Abdallah S. Daar, and Peter A. Singer. "Grand Challenges in Global Health." Science 302, (17 October 2003): 398-399. Article. 2 Images.. Science