A doctor performs an ultrasound scan on a prisoner during a health campaign at Lurigancho prison in Lima June 11, 2013. The campaign by the Ministry of Health provides specialized care in pulmonology, dermatology, ophthalmology, gastrology as well as vaccinations to at-risk groups in the prison, according to a media release. Lurigancho prison is one of the most overcrowded, violent, and unruly jails in Latin America with more than 8,500 prisoners. REUTERS/Mariana Bazo (PERU - Tags: CRIME LAW HEALTH SOCIETY)