Medecins Sans Frontières, which means Doctors Without Borders, is a global aid organisation based in France.
Use Medecins Sans Frontières (Doctors Without Borders) on first mention, if explanation is required. MSF is acceptable on second mention. Never use “DWB.”
From MSF: Médecins Sans Frontières (MSF) is an independent, medical humanitarian organisation that delivers emergency aid to people affected by armed conflict, epidemics, natural disasters and exclusion from healthcare. MSF offers assistance to people based on need, irrespective of race, religion, gender or political affiliation.