1. Second Children’s Clinic of Slovak Medical University, Children’s Department Hospital and Polyclinic; Health Care Department of Slovak Medical University
2. Clinic for Pediatric Anesthesiology and Intensive Medicine, Department of Medicine of the Shafarik Kosice University and Children’s University Hospital
3. Getlik Clinic for Children and Adolescents, Slovak Medical University and University Hospital; St. Elizabeth University of Health and Social Sciences
4. Institute of Medical Disciplines, St. Elizabeth University of Health and Social sciences; National Cancer Institute