Since 1996, PIH's sister organization in Peru, Socios En Salud (SES), has been providing medical services in Lima. Based in the northern Lima district of Carabayllo, SES is now Peru's largest non-governmental health care organization, serving an estimated population of 700,000 inhabitants, many of whom have fled from poverty and political violence in Peru's countryside. As a valued partner to Peru's Ministry of Health, SES has also influenced national policies for prevention and treatment of multidrug-resistant tuberculosis and HIV and provides important training and support to help implement those policies nationwide.