How did they decide on the colors for the star of life?

This is for a research Essay I'm doing for school; please help me! thanks!

I want to know how did they decide on the colors for the Star Of Life?How did they decide on the colors for the star of life?The designed cross was adapted from the Medical Identification Symbol of the American Medical Association, which was patented by the American Medical Association in 1967.



http://en.wikipedia.org/wiki/Star_of_Lif鈥?/a>

vance and hines