INTERLEUKIN-6 RELEASE BY CULTURED PERIPHERAL BLOOD MONONUCLEAR CELLS INVERSELY CORRELATES WITH HEIGHT VELOCITY, BONE AGE, INSULIN-LIKE GROWTH FACTOR-I, AND INSULIN-LIKE GROWTH FACTOR BINDING PROTEIN-3 SERUM LEVELS IN CHILDREN WITH PERINATAL HUMAN IMMUNODEFICIENCY VIRUS-TYPE 1 INFECTION.