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1、1 The original author of this report is Neela Ranade, but it has been updated by Bob Lyke.Congressional Research Service。

2、Congressional Research Service The Library of CongressCRS Issue Brief for CongressReceived through the CRS WebOrder Code。

3、Congressional Research Service The Library of CongressCRS Issue Brief for CongressReceived through the CRS WebOrder Code。

4、Congressional Research Service The Library of CongressCRS Issue Brief for CongressReceived through the CRS WebOrder Code。

5、Congressional Research Service The Library of CongressCRS Issue Brief for CongressReceived through the CRS WebOrder Code。