Médecins Sans Frontières (USA) :
http://www.doctorswithoutborders.org/

Médecins Sans Frontières (International) :
http://www.msf.org/

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The Médecins Sans Frontières (aka Doctors Without Borders) is an international independent medical humanitarian organization that delivers emergency aid to people affected by armed conflict, epidemics, natural and man-made disasters, and exclusion from health care.

The Médecins Sans Frontières is committed to two objectives : providing aid whenever needed, regardless of race, religion or politics; and raising awareness of the plight of the people we help.
 
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A *salute* to the thousands of volunteers (both medical and non-medical) who serve the MSF with their time, effort and love.