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

Sergei S. Nikitin, Dr. Sci. (Med.), Professor of the Department of Pediatrics and Pediatric Surgery of the Medical Institute; Head of the Center for Pediatric Urology, Andrology and Nephrology

33, Lenin Ave., Petrozavodsk, Republic of Karelia, 185910

58, Parkovaya St., Petrozavodsk, Republic of Karelia, 185002

N. B. Guseva
Russian Medical Academy of Continuous Professional Education; Children’s City Clinical Hospital No. 9 named after G.N. Speransky; Veltischev Research and Clinical Institute for Pediatrics and Pediatric Surgery of the Pirogov Russian National Research Medical University
Russian Federation

Natalia B. Guseva, Dr. Sci. (Med.), Professor of the Department of Pediatrics; Head of the Moscow City Center of Pediatric Urology, Andrology and Pathology of Pelvic Organs; Chief Researcher of the Research Clinical Institute

2/1, Bldg. 1, Barrikadnaya St., Moscow, 125993

29, Shmitovsky Proezd, Moscow, 123317

2, Taldomskaya St., Moscow, 125412

S. A. Kononova
Petrozavodsk State University
Russian Federation

Svetlana A. Kononova, senior lecturer of the department of Pediatrics and Pediatric surgeru of the Medical Institute

33, Lenin Ave., Petrozavodsk, Republic of Karelia, 185910

A. A. Tyukina
Petrozavodsk State University
Russian Federation

Alina A. Tyukina, Student

33, Lenin Ave., Petrozavodsk, Republic of Karelia, 185910