Tatiana is HIV-positive and lives in Ukraine with her three children. She contracted the virus from her husband, who died last year.
A picture hanging on Tatiana's living-room wall represents a perfect holiday, far away from the reality of the house it sits in.
Konstantin is a medic, social worker and bar owner. He suffers from Hepatitis C and has devoted most of his time to helping drug users take the necessary precautions to avoid a similar fate. He has a glass eye from trauma he suffered during the Chechen conflict.
A typical courtyard in Odessa, Ukraine. Ukraine has one of the highest rates of HIV infection in Europe, according to the United Nations Program on HIV/AIDS.
Roman prepares his methadone inside an unused building in Kiev, Ukraine. The 17th floor is a secret spot where drug users can shoot up.
Two nurses take a break outside of a maternity ward in Kramatorsk, Ukraine. According to photographer Pascal Vossen and writer Nils Adler, the ward had no functioning toilets -- a sign of its poor condition.
Children at Odessa's Way Home Centre take part in an English class. Many of these children are orphans or come from families that have been displaced because of conflict. The organization also takes care of children who have an HIV-positive parent struggling to raise their child.
Tanya, 19, is homeless in Odessa. She was born HIV-positive, and she ran away from home at an early age.
The harbor town of Chornomorsk, which Vossen and Adler said is notorious for its prostitution.
A sex worker in Mykolaivka, Ukraine. She is HIV-positive and suffers from Hepatitis B and C and will often meet with two clients a night. Vossen and Adler says she is bottom of the rung because she is HIV-positive, so she cannot charge very much or demand that her clients use protection.
Juvenile inmates listen to priests sing at a penitentiary in Pryluky, Ukraine. Prison populations are another at-risk group for HIV, according to Vossen and Adler. There was an enormous amount of misconception about HIV, they said, with some of the prisoners believing it was spread by mosquitoes, kissing and hand-holding.
HIV medication lies on a table in Dnipropetrovsk, Ukraine.