1. I.M. Sechenov Moscow Medical Academy; Research Institute of Pediatrics and Children’s Health in Petrovsky National Research Centre of Surgery; Children’s outpatients clinic No. 32
2. I.M. Sechenov Moscow Medical Academy; Research and Clinical Institute for Children
3. Veltischev Research and Clinical Institute for Pediatrics and Pediatric Surgery of the Pirogov Russian National Research Medical University
4. Research Institute of Pediatrics and Children’s Health in Petrovsky National Research Centre of Surgery; Pirogov Russian National Research Medical University
5. Research Institute of Pediatrics and Children’s Health in Petrovsky National Research Centre of Surgery
6. Children’s outpatients clinic No. 32