问题:
[多选题]课程中的RAINBOW研究(Ranibizumab versus laser therapy for the treatment of very low birthweight infants with retinopathy (RAINBOW): an open-label randomized controlled trial)使用了哪种对照( )
A 安慰剂对照
B 空白对照
C 剂量反应对照
D 阳性对照
E 外部对照
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