1. Abdurakhmanov AZh, Tazhin KB, Anashev TS. Vrozhdennye deformatsii grudnoj kletki i ikh lechenie. Traumatology and Orthopaedics of Kazakhstan. 2010;1:3-7. (In Russ)
2. Aprosimov SI, Dudarev VA, Axel’rov MA, et al. Pectus excavatum in children: evaluation of life quality before and after operative treatment. Vyatskij meditsinskij vestnik. 2018;3(59):4-11. (In Russ)
3. Verdiev VG, Bairamov AZ. Surgical treatment of funnel chest in children and adolescents by metal sternochondroplasty. Genij ortopedii. 2013;1:103-107. (In Russ)
4. Goremykin IV, Pogosyan KL, Lukyanenko EA. Ratio of degree of funnel chest deformity with severity of connective tissue dysplasia in children. Saratovskij nauchno-meditsinskij zhurnal. 2012;8(3):842-845. (In Russ)
5. Gubina EV, Ryzhikov DV. Khirugicheskoe lechenie voronkoobraznykh deformatsij grudnoj kletki v Novosibirskom NIITO. Byulleten’ VSNTs RAMN. 2011;4(80):43. (In Russ)]