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.

Inclusion Criteria:

- 1. Children and adolescents from 3 years of age with growth disturbance due to insufficient secretion of growth hormone who have received treatment with somotarogon or have been determined to start treatment with somatrogon according to the approved indications of the medicinal product;

2. Evidence of a personally signed and dated informed consent document indicating that the patient or their parent(s)/legal guardian, if applicable, have been informed of all pertinent aspects of the study.

Exclusion Criteria:

1. Patients concurrently participating in other studies involving therapeutic interventions and/or investigational products;
2. Patients who have contraindications to somatrogon as specified in the approved LPD.
3. Patients with hypersensitivity or case history to somatrogon or to any of the excipients in the product

The study will be performed in patients who have received at least 1 dose of Ngenla® pre-filled pen injection for the following indications as per local product label. (Treatment of children and adolescents from 3 years of age with growth disturbance due to insufficient secretion of growth hormone)

Pfizer will provide access to individual de-identified participant data and related study documents (e.g. protocol, Statistical Analysis Plan (SAP), Clinical Study Report (CSR)) upon request from qualified researchers, and subject to certain criteria, conditions, and exceptions. Further details on Pfizer's data sharing criteria and process for requesting access can be found at: https://www.pfizer.com/science/clinical\_trials/trial\_data\_and\_results/data\_requests.