共 22 条
[1]
BARTLETT RH, 1985, PEDIATRICS, V76, P479
[2]
When are placebo-controlled trials no longer appropriate?
[J].
CONTROLLED CLINICAL TRIALS,
1997, 18 (06)
:602-612
[3]
Brody BA, 1997, CONTROL CLIN TRIALS, V18, P661