For a single return trip from Paris to Brussels, a point to point ticket is the best value for money and the cheapest train ticket. Best prices are available when buying the train ticket well in advance. For extensive train travel, a rail pass for France and Belgium is a better choice.
creÂ·tinÂ·ism. n. A congenital condition due to thyroid hormone deficiency during fetal development and marked in childhood by dwarfed stature, mental retardation, dystrophy of the bones, and a low basal metabolism. Also called congenital myxedema, cretinoid dysplasia.
A lack of growth hormone causes growth hormone deficiency. You can be born with this condition. If that happens, it's called congenital growth hormone deficiency. But growth hormone deficiency can also develop during childhood or when you're an adult, which is called acquired growth hormone deficiency. This can cause a child to be very short or an adult to have very low bone density and muscle strength.