7. Patients must have adequate renal function defined as creatinine clearance or radioisotope GFR (glomerular filtration rate) >/=70mL/min/1.73m^2 or a serum creatinine based on age/gender less than the listed value in the table below: 1 to <2 years 0.6mg/dL for both males and females, 2 to <6 years 0.8mg/dL for both males and females, 6 to <10 years 1.0mg/dL for both males and females