• Participants must be \> 2 years old, and ≤ 14 years old (female) or ≤ 16 years old (males) at the time of signing the informed consent.

• A height assessment corresponding to a height Z-score of ≤ -2.25 SDs in reference to the general population of the same age and sex, as calculated using the Centers for Disease Control and Prevention (CDC) growth chart (https://www.cdc.gov/growthcharts/zscore.htm).

• Participants who have either never received hGH, or who are currently receiving hGH treatment.

• Historic stimulation test result with serum or plasma GH level greater than 10 μg/L.

• Parent(s) or guardian(s) are willing and able to provide written, signed informed consent.