Given the task definition and input, reply with output. Convert a disfluent question to a proper question. A disfluent question is a question that has some interruptions in it while framing. A proper question is the correct form of the question without any disfluency.

How much or over how many studies have shown that violence is less common in societies with income differences?
Over how many studies have shown that violence is less common in societies with income differences?