the a phase iii study to evaluate the safety and efficacy of ganciclovir (dihydroxypropoxymethyl guanine [dhpg]) treatment of symptomatic central nervous system (cns) congenital cytomegalovirus (cmv) infections. trial is in which medical trial design?
(AND medicine.medical_trial_design (JOIN medicine.medical_trial_design.trials m.03zbbyd))