1. Health and Social Development Foundation, Sofia, Bulgaria
2. Center for AIDS Intervention Research (CAIR), Department of Psychiatry
and Behavioral Medicine, Medical College of Wisconsin, 2071 N. Summit Avenue,
Milwaukee, WI 53202, USA and Faculty of Sociology, St Petersburg State University,
St Petersburg, Russia
3. Center for AIDS Intervention Research (CAIR), Department of Psychiatry
and Behavioral Medicine, Medical College of Wisconsin, 2071 N. Summit Avenue,
Milwaukee, WI 53202, USA