S. S. Nikitin
Children's Republican Hospital named after I.N. Grigovich; Petrozavodsk State University
Russian Federation

Sergey S. Nikitin - Dr. Sci. (Med.), Professor, Department of Pediatrics and Pediatric Surgery, Medical Institute, Petrozavodsk State University; Head of the Center for Pediatric Urology, Andrology and Nephrology, Children's Republican Hospital named after I.N. Grigovich.

33, Lenin Ave., Petrozavodsk, 185002; 58, Parkovaya St., Petrozavodsk, 185002.

N. B. Guseva
Children's City Clinical Hospital No. 9 named after G.N. Speransky; University Clinic of Pediatric Surgery of Research Institute of Clinical Surgery, Pirogov Russian National Research Medical University; Russian Medical Academy of Continuous Professional Education
Russian Federation

Natalia B. Guseva - Dr. Sci. (Med.), Professor, Head of the Moscow City Center for Pediatric Urology, Andrology and Pathology of the Pelvic Organs, Children's City Clinical Hospital No. 9 named after G.N. Speransky; Chief Researcher, Department of Pediatric Surgery, University Clinic of Pediatric Surgery of Research Institute of Clinical Surgery, Pirogov Russian National Research Medical University; Professor, Department of Pediatrics, Russian Medical Academy of Continuous Professional Education.

29, Shmitovsky Proezd, Moscow, 123317; 1, Ostrovityanov St., Moscow, 117997; 2/1, Bldg. 1, Barrikadnaya St., Moscow, 125993.

V. V. Derbenev
Children's Republican Hospital named after I.N. Grigovich
Russian Federation

Valeriy V. Derbenev - Cand. Sci. (Med.), Head of Endoscopy Service, Children's Republican Hospital named after I.N. Grigovich.

58, Parkovaya St., Petrozavodsk, 185002.

I. Yu. Shevchenko
Children's Republican Hospital named after I.N. Grigovich
Russian Federation

Irina Yu. Shevchenko - Endoscopist, Children's Republican Hospital named after I.N. Grigovich.

58, Parkovaya St., Petrozavodsk, 185002.

V. S. Nikitin
Petrozavodsk State University
Russian Federation

Vadim S. Nikitin - Student of the Medical Institute, Petrozavodsk State University.

33, Lenin Ave., Petrozavodsk, 185002.