GH1 and celiac disease: After ruling out several disorders as possible cause of the deflecting growth (i.e., celiac disease, renal/liver dysfunction, hematological diseases, and systemic/inflammatory diseases), around the age of 3 years GH stimulation testing (arginine and L-dope and propranolol) showed a maximum GH concentration of 59.0 mE/L, ruling out classical growth hormone deficiency.