请帮忙分析一下这句话的句子成分

Question

There were no significant differences in facial skin parameters between the verum and placebo groups

Answer 1

There were no significant differences in facial skin parameters between the verum and placebo groups，这是个简单句，There were为存在句，no significant differences 主语；
in facial skin parameters定语，修饰no significant differences；between the verum and placebo groups地点状语。追问

这句话的谓语呢？

这句话的谓语呢？