in a latin-square double-crossover with random assignment to sequence , 18 boys , aged 6-12 years , with attention-deficit hyperactivity disorder received 1 month each of placebo , d-amphetamine , and efamol ( evening primrose oil containing gamma-linolenic acid , with vitamin e as preservative ) .
C1263846
attention-deficit hyperactivity disorder
C0011812
d-amphetamine