Sixty-seven children started PI-based ART and were randomized to switch at 1000 copies/mL ( PI-1000 ) , 64 PIs and 30,000 copies/mL ( PI-30 ,000 ) , 67 NNRTIs and 1000 copies/mL ( NNRTI-1000 ) , and 65 NNRTI and 30,000 copies/mL ( NNRTI-30 ,000 ) .