Group A will receive concentration-controlled/monitored MMF with an oral CNI, either cyclosporine or tacrolimus. Depending on body surface area and age, MMF may be given in capsule, tablet, oral suspension, or intravenous (IV) form. The initial dose will be at least 1 gram twice a day (BID) in adults and 600 milligrams per meter-squared (mg/m^2) in pediatrics. Subsequent doses will be adjusted to maintain blood mycophenolic acid (MPA) levels greater than or equal to (≥) 1.3 micrograms per milliliter (μg/mL) with cyclosporine or ≥1.9 μg/mL with tacrolimus. The selected CNI will be dosed to maintain reduced blood concentrations. Cyclosporine target concentrations are as follows: Days 1-30, 250-325 nanograms per milliliter (ng/mL); Days 30-90, 125-165 ng/mL; Days 90 through end of study, 95-145 ng/mL. Tacrolimus target concentrations areas follows: Days 1-30, 8-12 ng/mL; Days 30-90, 4-6 ng/mL; Days 90 through end of study, 3-5 ng/mL.

Group B will receive concentration-controlled/monitored MMF with an oral CNI, either cyclosporine or tacrolimus. Depending on body surface area and age, MMF may be given in capsule, tablet, oral suspension, or IV form. The initial dose will be at least 1 gram BID in adults and 600 mg/m^2 in pediatrics. Subsequent doses will be adjusted to maintain blood MPA levels ≥1.3 μg/mL with cyclosporine or ≥1.9 μg/mL with tacrolimus. The selected CNI will be dosed to maintain standard/full blood concentrations. Cyclosporine target concentrations are as follows: Days 1-30, 250-325 ng/mL; Days 30-90, 250-270 ng/mL; Days 90 through end of study, 190-220 ng/mL. Tacrolimus target concentrations are as follows: Days 1-30, 8-12 ng/mL; Days 30-90, 8-10 ng/mL; Days 90 through end of study, 6-8 ng/mL.

Depending on body surface area and age, MMF may be given in capsule, tablet, oral suspension, or IV form. The initial dose will be at least 1 gram BID in adults and 600 mg/m^2 in pediatrics. In Groups A and B, subsequent doses will be adjusted to maintain blood MPA levels ≥1.3 μg/mL with cyclosporine or ≥1.9 μg/mL with tacrolimus. In Group C, subsequent doses are not to be adjusted, except in the case of unacceptable toxicity.