In 2005, a critical review of the PCBS figures and methodology was conducted by the American-Israel Demographic Research Group (AIDRG). In their report, they claimed that several errors in the PCBS methodology and assumptions artificially inflated the numbers by a total of 1.3 million. The PCBS numbers were cross-checked against a variety of other sources (e.g., asserted birth rates based on fertility rate assumptions for a given year were checked against Palestinian Ministry of Health figures as well as Ministry of Education school enrollment figures six years later; immigration numbers were checked against numbers collected at border crossings, etc.). The errors claimed in their analysis included: birth rate errors (308,000), immigration & emigration errors (310,000), failure to account for migration to Israel (105,000), double-counting Jerusalem Arabs (210,000), counting former residents now living abroad (325,000) and other discrepancies (82,000). The results of their research was also presented before the United States House of Representatives on 8 March 2006.