1. Research and Clinical Institute for Children; Belgorod State University
2. Saint Petersburg State Pediatric Medical University
3. Almazov National Medical Research Centre
4. Almazov National Medical Research Centre; North-Western State Medical University named after I.I. Mechnikov
5. Research Institute of Pediatrics and Children’s Health in Petrovsky National Research Centre of Surgery; Pirogov Russian National Research Medical University
6. Pirogov Russian National Research Medical University