http://www.sec.gov/Archives/edgar/data/1708287/000110465917040884/a17-15140_6424b2.htm
http://www.sec.gov/Archives/edgar/data/1706612/000114420417033662/v469433_424b5.htm
http://www.sec.gov/Archives/edgar/data/1121142/000119312517210418/d383589d424b3.htm
http://www.sec.gov/Archives/edgar/data/1622353/000157104917006124/t1701948-424b2.htm