1. University Clinic of Pediatrics, Medical Faculty, Ss. Cyril and Methodius University, Skopje, Republic of Macedonia
2. General Hospital Borka Taleski, Prilep, Republic of Macedonia
3. University Clinic of Pediatrics, Vodnjanska 17, 1000 Skopje, Republic of Macedonia. Tel.: +389(0)2-3123-224. Fax: +389(0)2-3111-713.