1. University Clinic for Plastic and Reconstructive Surgery, Skopje, Macedonia (the former Yugoslav Republic of)
2. University Clinic of Urology, Skopje, Macedonia (the former Yugoslav Republic of)
3. University Clinic for Toracovascular Surgery, Skopje, Macedonia (the former Yugoslav Republic of)
4. Intensive Care Unit, Skopje, Macedonia (the former Yugoslav Republic of)
5. Department of Nephrology, Medical Faculty, University of Skopje, Macedonia (the former Yugoslav Republic of)