This non-interventional study will be performed by design of post-marketing surveillance (PMS) as an additional pharmacovigilance activity of the Risk Management Plan (RMP) for Ngenla® pre-filled pen injection, which is required by the Ministry of Food and Drug Safety (MFDS) according to the local regulation. This post-marketing surveillance will investigate the safety and effectiveness of Ngenla® pre-filled pen injection as the treatment of children and adolescents from 3 years of age with growth disturbance due to insufficient secretion of growth hormone during 6 years under the setting of routine practice in Korea.