GH1 and growth delay due to insulin-like growth factor type 1 deficiency: Applying more restrictive diagnostic criteria for GHD in childhood (the necessity of confirming an IGF-1 deficiency, lower cut-offs for the GH peak in stimulation tests) may decrease the number of patients who qualify for rhGH therapy, but not the incidence of transient GHD among treated patients, if the same pre-treatment criteria are applied during retesting.