Efficacy and Safety Evaluation of Recombinant Human Growth Hormone (r-hGH), Saizen®, on a Population of Children With Hypochondroplasia, Treated at Least 3 Years or Until Near Final Height, When Applicable, in Comparison With a Historic Cohort of Non-treated Children

Subjects will receive a single subcutaneous injection of recombinant human growth hormone (r-hGH) equivalent to a dose of 0.057 milligram per kilogram per day (mg/kg/day). The dose will be subsequently adjusted during the trial and subjects will be treated for at least 3 years or until near final height is reached.