I want to know the answer to the following question:
Which researchers studied corruption from Sub-Saharan countries from 1970 to 1996?
All the background I'm provided with is that "University of Massachusetts Amherst researchers estimated that from 1970 to 1996, capital flight from 30 Sub-Saharan countries totaled $187bn, exceeding those nations' external debts.". Is that enough to answer the question?
Answer: yes