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.
1 Thyroid Stimulating Hormone (TSH) â causes the thyroid gland to produce thyroid hormone, which regulates body metabolism and is essential for normal growth.  Adrenocorticotropic Hormone (ACTH) â causes the adrenal glands to produce cortisol (stress hormone) and other hormones that enable the body to respond to stress. Too much cortisol will cause growth failure in a child.